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Zeng J, Albooyeh M, Rajaei M, Sifat AA, Potma EO, Wickramasinghe HK, Capolino F. Direct detection of photoinduced magnetic force at the nanoscale reveals magnetic nearfield of structured light. SCIENCE ADVANCES 2022; 8:eadd0233. [PMID: 36351014 PMCID: PMC9645709 DOI: 10.1126/sciadv.add0233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
We demonstrate experimentally the detection of magnetic force at optical frequencies, defined as the dipolar Lorentz force exerted on a photoinduced magnetic dipole excited by the magnetic component of light. Historically, this magnetic force has been considered elusive since, at optical frequencies, magnetic effects are usually overshadowed by the interaction of the electric component of light, making it difficult to recognize the direct magnetic force from the dominant electric forces. To overcome this challenge, we develop a photoinduced magnetic force characterization method that exploits a magnetic nanoprobe under structured light illumination. This approach enables the direct detection of the magnetic force, revealing the magnetic nearfield distribution at the nanoscale, while maximally suppressing its electric counterpart. The proposed method opens up new avenues for nanoscopy based on optical magnetic contrast, offering a research tool for all-optical spin control and optomagnetic manipulation of matter at the nanoscale.
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Affiliation(s)
- Jinwei Zeng
- Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
| | - Mohammad Albooyeh
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
- Mobix Labs Inc., 15420 Laguna Canyon, Irvine, CA 92618, USA
| | - Mohsen Rajaei
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
| | - Abid Anjum Sifat
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
| | - Eric O. Potma
- Department of Chemistry, University of California, Irvine, Irvine, CA 92697, USA
| | - H. Kumar Wickramasinghe
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
| | - Filippo Capolino
- Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA 92697, USA
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Zhang L, Meng C, Zhang G, Bai D, Gao F, Xu L, Zhang W, Mei T, Zhao J. Nanofocusing of a metallized double periodic arranged nanocone array for surface-enhanced Raman spectroscopy. OPTICS EXPRESS 2021; 29:28086-28095. [PMID: 34614947 DOI: 10.1364/oe.435046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 08/05/2021] [Indexed: 06/13/2023]
Abstract
A plasmonic double periodic arranged nanocone array (DPANA) integrated by nanotips and nanogaps exhibit strong capability of light compression, and thus lead to extremely enhanced electric near-field intensity. The DPANA is fabricated by the self-assembled mask integrated with the inductively couple plasma (ICP) etching technology. Finite-difference time-domain (FDTD) simulations suggest that the metallized DPANA can generate a strong hotspot at the sharp tip apex and the nanogap between adjacent sharp tips. The electric-field enhancement characteristic is firstly verified with the help of the second-order surface nonlinear optical response of the metallized DPANA. The surface-enhanced Raman spectroscopy (SERS) examination of the metallized DPANA exhibits high sensitivity due to clearly presenting the Raman spectra of Rhodamine-6G (R6G) with concentrations down to 10 pM and has excellent uniformity, time stability, and recyclability, simultaneously. Furthermore, the principle demonstration of SERS practical application is also performed for thiram. This as-prepared SERS substrate has great potential application for trace amount detection.
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Kim E, Cho JW, Nguyen TK, Nguyen TTT, Yoon S, Choi JH, Park YC, Kim SK, Kim YS, Kim DW. MoS 2 monolayers on Si and SiO 2 nanocone arrays: influences of 3D dielectric material refractive index on 2D MoS 2 optical absorption. NANOSCALE 2018; 10:18920-18925. [PMID: 30288523 DOI: 10.1039/c8nr06597g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Heterostructures enable the control of transport and recombination of charge carriers, which are either injected through electrodes, or created by light illumination. Instead of full 2D-material-heterostructures in device applications, using hybrid heterostructures consisting of 2D and 3D materials is an alternative approach to take advantage of the unique physical properties of 2D materials. In addition, 3D dielectric nanostructures exhibit useful optical properties such as broadband omnidirectional antireflection effects and strongly concentrated light near the surface. In this work, the optical properties of 2D MoS2 monolayers conformally coated on 3D Si-based nanocone (NC) arrays are investigated. Numerical calculations show that the absorption in MoS2 monolayers on SiO2 NC is significantly enhanced, compared with that for MoS2 monolayers on Si NC. The weak light confinement in low refractive index SiO2 NC leads to greater absorption in the MoS2 monolayers. The measured photoluminescence and Raman intensities of the MoS2 monolayers on SiO2 NC are much greater than those on Si NC, which supports the calculation results. This work demonstrates that 2D MoS2-3D Si nano-heterostructures are promising candidates for use in high-performance integrated optoelectronic device applications.
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Affiliation(s)
- Eunah Kim
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea.
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Cho Y, Cho B, Kim Y, Lee J, Kim E, Nguyen TTT, Lee JH, Yoon S, Kim DH, Choi JH, Kim DW. Broad-Band Photocurrent Enhancement in MoS 2 Layers Directly Grown on Light-Trapping Si Nanocone Arrays. ACS APPLIED MATERIALS & INTERFACES 2017; 9:6314-6319. [PMID: 28133960 DOI: 10.1021/acsami.6b15418] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
There has been growing research interest in realizing optoelectronic devices based on the two-dimensional atomically thin semiconductor MoS2 owing to its distinct physical properties that set it apart from conventional semiconductors. However, there is little optical absorption in these extremely thin MoS2 layers, which presents an obstacle toward applying them for use in high-efficiency light-absorbing devices. We synthesized trilayers of MoS2 directly on SiO2/Si nanocone (NC) arrays using chemical vapor deposition and investigated their photodetection characteristics. The photoresponsivity of the MoS2/NC structure was much higher than that of the flat counterpart across the whole visible wavelength range (for example, it was almost an order of magnitude higher at λ = 532 nm). Strongly concentrated light near the surface that originated from a Fabry-Perot interference in the SiO2 thin layers and a Mie-like resonance caused by the Si NCs boosted the optical absorption in MoS2. Our work demonstrates that MoS2/NC structures could provide a useful means to realize high-performance optoelectronic devices.
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Affiliation(s)
- Yunae Cho
- Department of Physics, Ewha Womans University , Seoul 03760, Korea
| | - Byungjin Cho
- Department of Advanced Functional Thin Films Department, Korea Institute of Materials Science (KIMS) , Changwon 51508, Korea
| | - Yonghun Kim
- Department of Advanced Functional Thin Films Department, Korea Institute of Materials Science (KIMS) , Changwon 51508, Korea
| | - Jihye Lee
- Department of Nanomanufacturing Research, Korea Institute of Machinery & Materials (KIMM) , Daejeon 34103, Korea
| | - Eunah Kim
- Department of Physics, Ewha Womans University , Seoul 03760, Korea
| | | | - Ju Hyun Lee
- Department of Physics, Ewha Womans University , Seoul 03760, Korea
| | - Seokhyun Yoon
- Department of Physics, Ewha Womans University , Seoul 03760, Korea
| | - Dong-Ho Kim
- Department of Advanced Functional Thin Films Department, Korea Institute of Materials Science (KIMS) , Changwon 51508, Korea
| | - Jun-Hyuk Choi
- Department of Nanomanufacturing Research, Korea Institute of Machinery & Materials (KIMM) , Daejeon 34103, Korea
| | - Dong-Wook Kim
- Department of Physics, Ewha Womans University , Seoul 03760, Korea
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Kim E, Cho Y, Sohn A, Hwang H, Lee YU, Kim K, Park HH, Kim J, Wu JW, Kim DW. Mie Resonance-Modulated Spatial Distributions of Photogenerated Carriers in Poly(3-hexylthiophene-2,5-diyl)/Silicon Nanopillars. Sci Rep 2016; 6:29472. [PMID: 27388122 PMCID: PMC4937449 DOI: 10.1038/srep29472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 06/20/2016] [Indexed: 01/19/2023] Open
Abstract
Organic/silicon hybrid solar cells have great potential as low-cost, high-efficiency photovoltaic devices. The superior light trapping capability, mediated by the optical resonances, of the organic/silicon hybrid nanostructure-based cells enhances their optical performance. In this work, we fabricated Si nanopillar (NP) arrays coated with organic semiconductor, poly(3-hexylthiophene-2,5-diyl), layers. Experimental and calculated optical properties of the samples showed that Mie-resonance strongly concentrated incoming light in the NPs. Spatial mapping of surface photovoltage, i.e., changes in the surface potential under illumination, using Kelvin probe force microscopy enabled us to visualize the local behavior of the photogenerated carriers in our samples. Under red light, surface photovoltage was much larger (63 meV) on the top surface of a NP than on a planar sample (13 meV), which demonstrated that the confined light in the NPs produced numerous carriers within the NPs. Since the silicon NPs provide pathways for efficient carrier transportation, high collection probability of the photogenerated carriers near the NPs can be expected. This suggests that the optical resonance in organic/silicon hybrid nanostructures benefits not only broad-band light trapping but also efficient carrier collection.
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Affiliation(s)
- Eunah Kim
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Yunae Cho
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Ahrum Sohn
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Heewon Hwang
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Y U Lee
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Kyungkon Kim
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Hyeong-Ho Park
- Applied Device and Material Lab., Device Technology Division, Korea Advanced Nanofab Center (KANC), Suwon 443-270, Korea
| | - Joondong Kim
- Department of Electrical Engineering, Incheon National University, Incheon 406-772, Korea
| | - J W Wu
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Dong-Wook Kim
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
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