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Cai H, Wang M, Wu Z, Wang X, Liu J. Design of multilayer planar film structures for near-perfect absorption in the visible to near-infrared. OPTICS EXPRESS 2022; 30:35219-35231. [PMID: 36258478 DOI: 10.1364/oe.469855] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 08/08/2022] [Indexed: 06/16/2023]
Abstract
In this work, a near-perfect broadband absorber, consisting of Fe, MgF2, Fe, TiO2 and MgF2 planar film, is proposed and investigated through simulations and experiments. The Fe material is first applied in the multilayer film structure, and it is proved to be more favorable for achieving broadband absorption. MgF2 and TiO2 are chosen as anti-reflection coatings to decrease unwanted reflections. The proposed absorber is optimized by employing a hybrid numerical method combining the transfer matrix method (TMM) and the genetic algorithm (GA). Under normal incidence conditions, the average absorption of the absorber is 97.6% in the range of 400 to 1400 nm. The finite difference time domain (FDTD) method and phase analysis reveal that the anti-reflection property and the Fabry-Perot resonance result in broadband absorption performance. Furthermore, when an additional Fe-MgF2 layer is inserted on the bottom Fe layer, an average absorption of 97.9% in the range of 400 to 2000 nm can be achieved. Our approach could be of vital significance for numerous applications involving solar energy.
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2
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Chen J, Gong M, Fan Y, Feng J, Han L, Xin HL, Cao M, Zhang Q, Zhang D, Lei D, Yin Y. Collective Plasmon Coupling in Gold Nanoparticle Clusters for Highly Efficient Photothermal Therapy. ACS NANO 2022; 16:910-920. [PMID: 35023718 DOI: 10.1021/acsnano.1c08485] [Citation(s) in RCA: 48] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Plasmonic nanomaterials with strong absorption at near-infrared frequencies are promising photothermal therapy agents (PTAs). The pursuit of high photothermal conversion efficiency has been the central focus of this research field. Here, we report the development of plasmonic nanoparticle clusters (PNCs) as highly efficient PTAs and provide a semiquantitative approach for calculating their resonant frequency and absorption efficiency by combining the effective medium approximation (EMA) theory and full-wave electrodynamic simulations. Guided by the theoretical prediction, we further develop a universal strategy of space-confined seeded growth to prepare various PNCs. Under optimized growth conditions, we achieve a record photothermal conversion efficiency of up to ∼84% for gold-based PNCs, which is attributed to the collective plasmon-coupling-induced near-unity absorption efficiency. We further demonstrate the extraordinary photothermal therapy performance of the optimized PNCs in in vivo application. Our work demonstrates the high feasibility and efficacy of PNCs as nanoscale PTAs.
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Affiliation(s)
- Jinxing Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, P.R. China
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Mingfu Gong
- Department of Radiology, Xinqiao Hospital, Army Medical University, Chongqing 400037, P.R. China
| | - Yulong Fan
- Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, P.R. China
| | - Ji Feng
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Lili Han
- Department of Physics & Astronomy, University of California, Irvine, California 92697, United States
| | - Huolin L Xin
- Department of Physics & Astronomy, University of California, Irvine, California 92697, United States
| | - Muhan Cao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, P.R. China
| | - Qiao Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123, P.R. China
| | - Dong Zhang
- Department of Radiology, Xinqiao Hospital, Army Medical University, Chongqing 400037, P.R. China
| | - Dangyuan Lei
- Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, P.R. China
| | - Yadong Yin
- Department of Chemistry, University of California, Riverside, California 92521, United States
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3
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Zhao Z, Li G, Su T, Yu F, Zhang Y, Wang W, Men W, Wang Z, Xuan L, Chen X, Lu W. Selectively thermal radiation control in long-wavelength infrared with broadband all-dielectric absorber. OPTICS EXPRESS 2019; 27:35088-35095. [PMID: 31878684 DOI: 10.1364/oe.27.035088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 11/04/2019] [Indexed: 06/10/2023]
Abstract
Artificial control of the thermal radiation is of growing importance to fundamental science and technological applications, ranging from waste heat recovery to thermophotovoltaics. Nanophotonics has been proven to be an efficient approach to manipulate the radiation. In comparison with structures utilizing planar subwavelength scale lithography, in this paper, we propose a cascaded all-dielectric multilayer structure to selectively manipulate the thermal radiation characteristics in long-wavelength infrared (LWIR). The broadband emissivity in non-atmospheric windows (6.3-7.5 µm) can reach 0.95 and the average absorption rate is below 3% in atmospheric windows (8-14 µm). The multilayer structure is insensitive to the polarization of the incident waves and maintains a good rectangular absorptivity curve even with large oblique incidence angle at 45 degrees. The outstanding properties of the nanostructures promise various applications in infrared sensing and thermal imaging.
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4
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Shen S, Tang J, Yu J, Zhou L, Zhou Y. Double-sided and omnidirectional absorption of visible light in tapered dielectric nanostructure coated with non-noble metal. OPTICS EXPRESS 2019; 27:24989-24999. [PMID: 31510379 DOI: 10.1364/oe.27.024989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 08/03/2019] [Indexed: 06/10/2023]
Abstract
The common complex architecture constitutes the major bottleneck of optical absorber operating on broadband spectrum. Here we demonstrate a super absorber consisting of tapered dielectric nanostructure coated with a thin-layer of non-noble metal chromium on flexible poly(ethylene terephthalate) substrate. The proposed device yields double-sided, omnidirectional, and polarization-independent absorption over the entire visible spectrum with an average efficiency more than 90% at normal incidence, and 80% at a tilt incident angle of 60°. It can be easily realized by nanoimprinting lithography combined with physical vapor deposition technique. Theoretical analysis demonstrates that the superior optical performance is ascribed to the non-resonant light absorption by using the metal-covered, closed-packed tapered nanostructure via adiabatic nanofocusing of the metal-dielectric-metal (MDM) guided modes excited by scattering of the gradually changing nanostructure. For the cost-effective fabrication and material strategy, the super absorber has potential applications in a wide range of passive and active photonic devices, including inkless printing, harvesting solar energy, as well as thermal emitter and optical detector.
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5
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Ghobadi A, Hajian H, Butun B, Ozbay E. Strong Interference in Planar, Multilayer Perfect Absorbers: Achieving High-Operational Performances in Visible and Near-Infrared Regimes. IEEE NANOTECHNOLOGY MAGAZINE 2019. [DOI: 10.1109/mnano.2019.2916113] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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6
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Design of planar and wideangle resonant color absorbers for applications in the visible spectrum. Sci Rep 2019; 9:7045. [PMID: 31065016 PMCID: PMC6504864 DOI: 10.1038/s41598-019-43539-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 04/26/2019] [Indexed: 11/19/2022] Open
Abstract
We propose a design approach for color absorbers based on a tri-layer metal-dielectric-metal (MDM) planar geometry, which maintains the same color absorbed, over a range of incident angles from 0° to 80° for light with TM polarization. The dielectrics are chosen to satisfy the ideal conditions of resonance. We calculate the ideal thickness of each dielectric layer by using the planar resonance theory. The numerical results show a total absorption above 85% for all colors of the absorber. We analyzed the influence of the of the metallic top layer thickness and we demonstrated the fabrication error tolerance of the proposed absorber. Finally, we present and discuss the physical mechanisms for the coupling of the electromagnetic field and the absorbed optical power in the structure.
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Contractor R, D'Aguanno G, Menyuk C. Ultra-broadband, polarization-independent, wide-angle absorption in impedance-matched metamaterials with anti-reflective moth-eye surfaces. OPTICS EXPRESS 2018; 26:24031-24043. [PMID: 30184896 DOI: 10.1364/oe.26.024031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
We computationally study periodic impedance-matched metal-dielectric metamaterials and the advantage of imprinting moth-eye surfaces on them. Impedance-matched metamaterials are known to act as strong, polarization-independent, broadband absorbers. However, in the infrared region far from the metal's plasma frequency, the reflection from metal layers dominates over the absorption. Using anti-reflective moth-eye surfaces we show that it is possible to obtain absorption independent of polarization or incidence angle, over an exceptionally broad frequency range from 400 nm to 6 μm.
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8
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Hybrid Metasurface Based Tunable Near-Perfect Absorber and Plasmonic Sensor. MATERIALS 2018; 11:ma11071091. [PMID: 29954060 PMCID: PMC6073872 DOI: 10.3390/ma11071091] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/24/2018] [Accepted: 06/25/2018] [Indexed: 01/21/2023]
Abstract
We propose a hybrid metasurface-based perfect absorber which shows the near-unity absorbance and facilities to work as a refractive index sensor. We have used the gold mirror to prevent the transmission and used the amorphous silicon (a-Si) nanodisk arrays on top of the gold mirror which helps to excite the surface plasmon by scattering light through it at the normal incident. We numerically investigated the guiding performance. The proposed absorber is polarization independent and shows a maximum absorption of 99.8% at a 932 nm wavelength in the air medium. Considering the real applications, by varying the environments refractive indices from 1.33 to 1.41, the proposed absorber can maintain absorption at more than 99.7%, with a red shift of the resonant wavelength. Due to impedance matching of the electric and magnetic dipoles, the proposed absorber shows near-unity absorbance over the refractive indices range of 1.33 to 1.41, with a zero-reflectance property at a certain wavelength. This feature could be utilized as a plasmonic sensor in detecting the refractive index of the surrounding medium. The proposed plasmonic sensor shows an average sensitivity of 325 nm/RIU and a maximum sensitivity of 350 nm/RIU over the sensing range of 1.33 to 1.41. The proposed metadevice possesses potential applications in solar photovoltaic and photodetectors, as well as in organic and bio-chemical detection.
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9
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Huang Y, Liu L, Pu M, Li X, Ma X, Luo X. A refractory metamaterial absorber for ultra-broadband, omnidirectional and polarization-independent absorption in the UV-NIR spectrum. NANOSCALE 2018; 10:8298-8303. [PMID: 29687812 DOI: 10.1039/c8nr01728j] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this paper, efficient ultra-broadband absorption from ultraviolet (UV) to near infrared (NIR) is achieved using a metamaterial perfect absorber (MPA) with refractory constituents. Both simulated and experimental results indicate that this proposed MPA exhibits an average absorption over 95% at wavelengths ranging from 200 nm to 900 nm. Besides, owing to the ultrathin thickness and symmetrical topology of this device, it exhibits great angular tolerance up to 60° independent of the incident polarizations. Excellent thermal stability is also demonstrated at high operation temperatures. The physical origin of the ultra-broadband characteristics is mainly based on diffraction/interference engineering at short wavelengths and the anti-reflection effect at long wavelengths. We believe that such a device may find potential applications ranging from photodetection and photothermal energy conversion to ultraviolet protection and thermophotovoltaics.
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Affiliation(s)
- Yijia Huang
- State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, P.O. Box 350, Chengdu 610209, China.
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10
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Lin A, Yang CC, Parashar P, Lin CY, Jian DR, Huang WM, Huang YW, Fu SM, Zhong YK, Tseng TY. An ultra-compact blackbody using electrophoretic deposited carbon nanotube films. RSC Adv 2018; 8:3453-3461. [PMID: 35542922 PMCID: PMC9077685 DOI: 10.1039/c7ra12113j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Accepted: 01/10/2018] [Indexed: 11/21/2022] Open
Abstract
Carbon nanotubes (CNTs) possesses decent optical properties and thus can be considered as a candidate for perfect absorbers due to their close-to-air refractive index and minimal extinction. However, weak absorption in porous materials, due to the low extinction coefficients, requires an inevitably thick absorption layer (∼100 μm) for the perfect opaque absorbers. Thus, the requirement of large thicknesses of CNTs prohibits them from being used as miniaturized integrated photonic devices. Here, we propose an electrophoretic deposited (EPD) CNT resonant cavity structure on tantalum (Ta) to enhance optical absorption. Efficient random light scattering along with the resonant cavity structure using Ti/SiO2 stacking enhances the absorption in our proposed EPD-CNT film while maintaining the total device thickness to <1 μm. The experiment results reveal that the absorption band covers the entire UV-VIS-NIR spectrum (λ = 0.3–2.6 μm), using resonant-cavity EPD-CNT design. The EPD deposition process is done at relatively low temperature < 120 °C. We believe that this proposal is very promising for sensing, antenna, and thermophotovoltaics (TPV), in terms of bandwidth, compactness and cost. Electrophoretic-deposited carbon nanotubes (EPD-CNTs) possess decent optical properties and low-cost processing and thus can be used as an ideal black body with compact dimension.![]()
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Affiliation(s)
- Albert Lin
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Chien-Chih Yang
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Parag Parashar
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Chien-Yung Lin
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Ding Rung Jian
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Wei-Ming Huang
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Yi-Wen Huang
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Sze Ming Fu
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Yan Kai Zhong
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
| | - Tseung Yuen Tseng
- Department of Electronics Engineering
- National Chiao-Tung University
- Hsinchu
- Taiwan 30010
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11
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Liu C, Zhang D, Liu Y, Wu D, Chen L, Ma R, Yu Z, Yu L, Ye H. Numerical Study of an Efficient Solar Absorber Consisting of Metal Nanoparticles. NANOSCALE RESEARCH LETTERS 2017; 12:601. [PMID: 29168003 PMCID: PMC5700009 DOI: 10.1186/s11671-017-2363-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 11/03/2017] [Indexed: 06/07/2023]
Abstract
We propose and theoretically investigate an efficient solar light absorber based on a multilayer structure consisting of tungsten nanoparticle layers and SiO2 layers. According to our calculation, average absorbance over 94% is achieved in the wavelength range between 400 and 2500 nm for the proposed absorber. The excellent performance of the absorber can be attributed to the localized surface plasmon resonance as well as the Fabry-Perot resonance among the metal-dielectric-metal layers. We compare the absorbing efficiency of tungsten nanosphere absorber with absorbers consisting of the other metal nanoparticles and conclude that iron can be an alternative material for tungsten in solar energy systems for its excellent absorbing performance and the similar optical properties as tungsten. Besides, a flat multilayer absorber is designed for comparison, and it is also proved to have a good absorbing performance for solar light.
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Affiliation(s)
- Chang Liu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - De Zhang
- Information Science Academy of China Electronics Technology Group Corporation, Beijing, 100876, China
| | - Yumin Liu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China.
| | - Dong Wu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - Lei Chen
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - Rui Ma
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - Zhongyuan Yu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - Li Yu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
- School of Science, Beijing University of Post and Telecommunications, Beijing, 100876, China
| | - Han Ye
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Post and Telecommunications, Beijing, 100876, China
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12
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Ghobadi A, Dereshgi SA, Hajian H, Birant G, Butun B, Bek A, Ozbay E. 97 percent light absorption in an ultrabroadband frequency range utilizing an ultrathin metal layer: randomly oriented, densely packed dielectric nanowires as an excellent light trapping scaffold. NANOSCALE 2017; 9:16652-16660. [PMID: 28901365 DOI: 10.1039/c7nr04186a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this paper, we propose a facile and large scale compatible design to obtain perfect ultrabroadband light absorption using metal-dielectric core-shell nanowires. The design consists of atomic layer deposited (ALD) Pt metal uniformly wrapped around hydrothermally grown titanium dioxide (TiO2) nanowires. It is found that the randomly oriented dense TiO2 nanowires can impose excellent light trapping properties where the existence of an ultrathin Pt layer (with a thickness of 10 nm) can absorb the light in an ultrabroadband frequency range with an amount near unity. Throughout this study, we first investigate the formation of resonant modes in the metallic nanowires. Our findings prove that a nanowire structure can support multiple longitudinal localized surface plasmons (LSPs) along its axis together with transverse resonance modes. Our investigations showed that the spectral position of these resonance peaks can be tuned with the length, radius, and orientation of the nanowire. Therefore, TiO2 random nanowires can contain all of these features simultaneously in which the superposition of responses for these different geometries leads to a flat perfect light absorption. The obtained results demonstrate that taking unique advantages of the ALD method, together with excellent light trapping of chemically synthesized nanowires, a perfect, bifacial, wide angle, and large scale compatible absorber can be made where an excellent performance is achieved while using less materials.
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Affiliation(s)
- Amir Ghobadi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey.
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13
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Ghobadi A, Hajian H, Dereshgi SA, Bozok B, Butun B, Ozbay E. Disordered Nanohole Patterns in Metal-Insulator Multilayer for Ultra-broadband Light Absorption: Atomic Layer Deposition for Lithography Free Highly repeatable Large Scale Multilayer Growth. Sci Rep 2017; 7:15079. [PMID: 29118435 PMCID: PMC5678139 DOI: 10.1038/s41598-017-15312-w] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 10/25/2017] [Indexed: 11/30/2022] Open
Abstract
In this paper, we demonstrate a facile, lithography free, and large scale compatible fabrication route to synthesize an ultra-broadband wide angle perfect absorber based on metal-insulator-metal-insulator (MIMI) stack design. We first conduct a simulation and theoretical modeling approach to study the impact of different geometries in overall stack absorption. Then, a Pt-Al2O3 multilayer is fabricated using a single atomic layer deposition (ALD) step that offers high repeatability and simplicity in the fabrication step. In the best case, we get an absorption bandwidth (BW) of 600 nm covering a range of 400 nm–1000 nm. A substantial improvement in the absorption BW is attained by incorporating a plasmonic design into the middle Pt layer. Our characterization results demonstrate that the best configuration can have absorption over 0.9 covering a wavelength span of 400 nm–1490 nm with a BW that is 1.8 times broader compared to that of planar design. On the other side, the proposed structure retains its absorption high at angles as wide as 70°. The results presented here can serve as a beacon for future performance enhanced multilayer designs where a simple fabrication step can boost the overall device response without changing its overall thickness and fabrication simplicity.
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Affiliation(s)
- Amir Ghobadi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey. .,Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey.
| | - Hodjat Hajian
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
| | - Sina Abedini Dereshgi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.,Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
| | - Berkay Bozok
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.,Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
| | - Bayram Butun
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
| | - Ekmel Ozbay
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey. .,Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey. .,Department of Physics, Bilkent University, 06800, Ankara, Turkey. .,UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey.
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14
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Ghobadi A, Dereshgi SA, Butun B, Ozbay E. Ultra-broadband Asymmetric Light Transmission and Absorption Through The Use of Metal Free Multilayer Capped Dielectric Microsphere Resonator. Sci Rep 2017; 7:14538. [PMID: 29109475 PMCID: PMC5674040 DOI: 10.1038/s41598-017-15248-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 10/24/2017] [Indexed: 11/08/2022] Open
Abstract
In this paper, we propose a simple design with an excellent performance to obtain high contrast in transmission asymmetry based on dielectric microspheres. Initially, we scrutinize the impact of the sphere radius on forward and backward transmissions. Afterward, by introducing a capping layer on top of the sphere, transmission response for the backward illuminated light will be blocked. In the next step, in order to replace the reflecting metal cap with a metal free absorbing design, we adopt a modeling approach based on the transfer matrix method (TMM) to explore an ideal material to achieve metal free perfect absorption in a multilayer configuration of material-insulator-material-insulator (MIMI). As a result of our investigations, it is found that Titanium Nitride (TiN) is an excellent alternative to replace metal in a MIMI multilayer stack. Setting this stack as the top capping coating, we obtain a high contrast between forward and backward light transmission where in an ultra-broadband range of 400 nm-1000 nm, forward transmission is above 0.85 while its backward response stays below 0.2. Moreover, due to the existence of multilayer stack, a high asymmetry is also observed for absorption profiles. This design has a relatively simple and large scale compatible fabrication route.
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Affiliation(s)
- Amir Ghobadi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey.
| | - Sina Abedini Dereshgi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
| | - Bayram Butun
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
| | - Ekmel Ozbay
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey.
- Department of Physics, Bilkent University, 06800, Ankara, Turkey.
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey.
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15
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Ultra-Broadband, Lithography-Free, and Large-Scale Compatible Perfect Absorbers: The Optimum Choice of Metal layers in Metal-Insulator Multilayer Stacks. Sci Rep 2017; 7:14872. [PMID: 29093519 PMCID: PMC5665894 DOI: 10.1038/s41598-017-13837-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 09/29/2017] [Indexed: 11/09/2022] Open
Abstract
We report ultra-broadband perfect absorbers for visible and near-infrared applications that are based on multilayers of metal-insulator (MI) stacks fabricated employing straightforward layer deposition techniques and are, therefore, lithography-free and large-scale compatible. We scrutinize the impact of different physical parameters of an MIMI absorber structure with analysis of each contributing metal layer. After obtaining the optimal design parameters (i.e. material selection and their thicknesses) with both simulation and numerical analysis (Transfer Matrix Method) methods, an experimental sample is fabricated and characterized. Our fabricated MIMI absorber consists of an optically thick tungsten (W) back reflector layer followed by 80 nm aluminum oxide (Al2O3), 10 nm titanium (Ti), and finally another 80 nm Al2O3. The experimental results demonstrate over 90 percent absorption between 400 nm and 1640 nm wavelengths that is optimized for ultra-broadband absorption in MIMI structures. Moreover, the impedance matching method with free-space is used to shed light on the metallic layer selection process.
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16
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Ghobadi A, Dereshgi SA, Hajian H, Bozok B, Butun B, Ozbay E. Ultra-broadband, wide angle absorber utilizing metal insulator multilayers stack with a multi-thickness metal surface texture. Sci Rep 2017; 7:4755. [PMID: 28684879 PMCID: PMC5500529 DOI: 10.1038/s41598-017-04964-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 05/22/2017] [Indexed: 11/25/2022] Open
Abstract
In this paper, we propose a facile route to fabricate a metal insulator multilayer stack to obtain ultra-broadband, wide angle behavior from the structure. The absorber, which covers near infrared (NIR) and visible (Vis) ranges, consists of a metal-insulator-metal-insulator (MIMI) multilayer where the middle metal layer has a variant thickness. It is found that this non-uniform thickness of the metal provides us with an absorption that is much broader compared to planar architecture. In the non-uniform case, each thickness is responsible for a specific wavelength range where the overall absorption is the superposition of these resonant responses and consequently a broad, perfect light absorption is attained. We first numerically examine the impact of different geometries on the overall light absorption property of the multilayer design. Afterward, we fabricate the designs and characterize them to experimentally verify our numerical findings. Characterizations show a good agreement with numerical results where the optimum absorption bandwidth for planar design is found to be 620 nm (380 nm-1000 nm) and it is significantly boosted to an amount of 1060 nm (350 nm-1410 nm) for multi-thickness case.
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Affiliation(s)
- Amir Ghobadi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey.
| | - Sina Abedini Dereshgi
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
| | - Hodjat Hajian
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
| | - Berkay Bozok
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey
| | - Bayram Butun
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey
| | - Ekmel Ozbay
- NANOTAM-Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
- Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey.
- Department of Physics, Bilkent University, 06800, Ankara, Turkey.
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey.
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Zhong YK, Fu SM, Huang W, Rung D, Huang JYW, Parashar P, Lin A. Polarization-selective ultra-broadband super absorber. OPTICS EXPRESS 2017; 25:A124-A133. [PMID: 28241515 DOI: 10.1364/oe.25.00a124] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
While a broadband metamaterial perfect absorber (MPA) has been implemented and proposed intensively in recent years, an ultra-broadband perfect absorber with polarization selectivity has not been realized in literature. In this work, we propose a configuration of polarization-selective (PS) MPA with ultra-wide absorption bandwidth. The aluminum wire grid is integrated on top of the ultrathin-metal-dielectric stacking. The transverse electric (TE) wave is blocked due to the requirement of zero tangential electric field at the metal surface. The transverse magnetic field can pass the aluminum wire-grids because the normal electric field can be supported by the surface charge density at the metal surface, and full absorption of the TM wave is accomplished by the metal-dielectric stacking beneath. Theoretical calculation using rigorously coupled wave analysis demonstrates the wavelength selectivity from λ = 1.98μm to λ = 11.74μm where the TE absorption is <0.04 while TM absorption is >0.95, using 300 nm thick aluminum (Al) wire grid with 16-pair SiO2/Ti stacking. Additionally, the design is wavelength scalable by adjusting the dielectric thickness (tSiO2) and the wire grid period (P) and height (t). The experimental result is demonstrated using Al grids and Ti/SiO2, and the measured result fully supports the calculated prediction.
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18
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Wang BX, Huang WQ, Wang LL. Ultra-narrow terahertz perfect light absorber based on surface lattice resonance of a sandwich resonator for sensing applications. RSC Adv 2017. [DOI: 10.1039/c7ra08413g] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ultra-narrow terahertz perfect light absorber based on surface lattice resonance of sandwich structure model is presented. The large sensing sensitivity and simultaneous ultra-narrow bandwidth lead to an ultra-high FOM (figure of merit) of 385.07.
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Affiliation(s)
| | - Wei-Qing Huang
- School of Physics and Electronics
- Hunan University
- Changsha
- China
| | - Ling-Ling Wang
- School of Physics and Electronics
- Hunan University
- Changsha
- China
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