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Sailor MJ. A Celebration of Meetings Large and Small: A Dispatch from the 2024 Porous Semiconductors Science and Technology International Conference. ACS Sens 2024; 9:2703-2704. [PMID: 38938155 DOI: 10.1021/acssensors.4c01337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
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Wu F, She Y, Cheng Z, Hu S, Liu G, Xiao S. Anomalous polarization-sensitive Fabry-Perot resonance in a one-dimensional photonic crystal containing an all-dielectric metamaterial defect. OPTICS EXPRESS 2023; 31:32669-32683. [PMID: 37859064 DOI: 10.1364/oe.499830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/24/2023] [Indexed: 10/21/2023]
Abstract
Owing to polarization-independent property of propagating phases inside isotropic dielectric layers, Fabry-Perot resonances in metal-dielectric-metal sandwich structures and one-dimensional (1-D) photonic crystals (PhCs) with isotropic dielectric defects are polarization-insensitive. Herein, we introduce an all-dielectric elliptical metamaterial (EMM) defect into a 1-D PhC to realize an anomalous polarization-sensitive Fabry-Perot resonance empowered by the polarization-sensitive property of the propagating phase inside the all-dielectric EMM layer. The wavelength difference of the Fabry-Perot resonance between transverse magnetic and transverse electric polarizations is larger than 100 nm at the incident angle of 45 degrees. Enabled by the polarization-sensitive property of the Fabry-Perot resonance, high-performance polarization selectivity can be achieved in a broad angle range. Our work offers a viable recipe, well within the reach of current fabrication technique, to explore polarization-dependent physical phenomena and devices.
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Yan R, Cui E, Zhao S, Zhou F, Wang D, Lei C. Real-time and high-sensitivity refractive index sensing with an arched optofluidic waveguide. OPTICS EXPRESS 2022; 30:16031-16043. [PMID: 36221456 DOI: 10.1364/oe.458280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 04/11/2022] [Indexed: 06/16/2023]
Abstract
Refractive index (RI) sensing plays an important role in analytical chemistry, medical diagnosis, and environmental monitoring. The optofluidic technique is considered to be an ideal tool for RI sensor configuration for its high integration, high sensitivity, and low cost. However, it remains challenging to achieve RI measurement in real time with high sensitivity and low detection limit (DL) simultaneously. In this work, we design and fabricate a RI sensor with an arched optofluidic waveguide by monitoring the power loss of the light passing through the waveguide, which is sandwiched by the air-cladding and the liquid-cladding under test, we achieve RI detection of the sample in real time and with high sensitivity. Furthermore, both numerical simulation and experimental investigation show that our RI sensor can be designed with different geometric parameters to cover multiple RI ranges with high sensitivities for different applications. Experimental results illustrate that our sensor is capable to achieve a superior sensitivity better than -19.2 mW/RIU and a detection limit of 5.21×10-8 RIU in a wide linear dynamic range from 1.333 to 1.392, providing a promising solution for real-time and high-sensitivity RI sensing.
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Bai L, Gao Y, Wang J, Aili T, Jia Z, Lv X, Huang X, Yang J. Detection of β-Lactoglobulin by a Porous Silicon Microcavity Biosensor Based on the Angle Spectrum. SENSORS 2022; 22:s22051912. [PMID: 35271059 PMCID: PMC8914963 DOI: 10.3390/s22051912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/10/2022] [Accepted: 02/23/2022] [Indexed: 11/16/2022]
Abstract
In this paper, carbon quantum dot-labelled β-lactoglobulin antibodies were used for refractive index magnification, and β-lactoglobulin was detected by angle spectroscopy. In this method, the detection light is provided by a He-Ne laser whose central wavelength is the same as that of the porous silicon microcavity device, and the light source was changed to a parallel beam to illuminate the porous silicon microcavity’ surface by collimating beam expansion, and the reflected light was received on the porous silicon microcavity’ surface by a detector. The angle corresponding to the smallest luminous intensity before and after the onset of immune response was measured by a detector for different concentrations of β-lactoglobulin antigen and carbon quantum dot-labelled β-lactoglobulin antibodies, and the relationship between the variation in angle before and after the immune response was obtained for different concentrations of the β-lactoglobulin antigen. The results of the experiment present that the angle variations changed linearly with increasing β-lactoglobulin antigen concentration before and after the immune response. The limit of detection of β-lactoglobulin by this method was 0.73 μg/L, indicating that the method can be used to detect β-lactoglobulin quickly and conveniently at low cost.
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Affiliation(s)
- Lanlan Bai
- School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China; (L.B.); (Y.G.)
| | - Yun Gao
- School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China; (L.B.); (Y.G.)
| | - Jiajia Wang
- School of Information Science and Engineering, Xinjiang University, Urumqi 830046, China; (J.W.); (X.H.)
- The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830046, China;
| | - Tuerxunnayi Aili
- School of Life Science and Technology, Xinjiang University, Urumqi 830046, China; (T.A.); (J.Y.)
| | - Zhenhong Jia
- School of Information Science and Engineering, Xinjiang University, Urumqi 830046, China; (J.W.); (X.H.)
- The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830046, China;
- Correspondence:
| | - Xiaoyi Lv
- The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830046, China;
- School of Software, Xinjiang University, Urumqi 830046, China
| | - Xiaohui Huang
- School of Information Science and Engineering, Xinjiang University, Urumqi 830046, China; (J.W.); (X.H.)
- The Key Laboratory of Signal Detection and Processing, Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830046, China;
| | - Jie Yang
- School of Life Science and Technology, Xinjiang University, Urumqi 830046, China; (T.A.); (J.Y.)
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Kant R, Goel H. In Situ Electrochemical Impedance Spectroscopic Method for Determination of Surface Roughness and Morphological Convexity. J Phys Chem Lett 2021; 12:10025-10033. [PMID: 34622659 DOI: 10.1021/acs.jpclett.1c02935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A novel in situ electrochemical impedance spectroscopy (EIS) method is developed for the determination of RMS roughness (h), electroactive roughness factor (Rc*), and morphological convexity (H̅*) of the electrode surface. Our method uses the angular frequency of maximum phase (ωM) in anomalous Warburg impedance to extract in situ RMS roughness (h). The compact electric double layer (C-EDL) formation frequency (ωH) is used to extract the electroactive roughness factor and morphological convexity. The theory unravels the inverse square root dependence of h on ωM through an elegant equation, h=D/ωM, where D is the diffusion coefficient of electroactive species. Similarly, the equation for the electroactive roughness factor is Rc* = ωH0/ωH and ωH0 is the smooth electrode C-EDL formation frequency. These equations are validated for the nanoparticles deposited and mechanically roughened Pt electrodes. Finally, this in situ method is applicable for both low and high roughness electrodes which transcend the limitations of contemporary methods.
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Affiliation(s)
- Rama Kant
- Complex Systems Group, Department of Chemistry, University of Delhi, Delhi-110007, India
| | - Himanshi Goel
- Complex Systems Group, Department of Chemistry, University of Delhi, Delhi-110007, India
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Cheng Q, Wang S, Lv J, Wang J, Liu N. Highly sensitive nanoparticle sensing based on a hybrid cavity in a freely suspended microfiber. NANOTECHNOLOGY 2021; 32:205203. [PMID: 33561840 DOI: 10.1088/1361-6528/abe48e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We report a hybrid cavity structure based on a suspended microfiber with a diameter of 1.7 μm applied to nanoparticle sensing in water. The proposed hybrid cavity is composed of two symmetrical reflectors with a slotted Au layer in the middle. After being characterized by the finite-difference time-domain method, the obtained strong reflection and sufficiently wide band gap provide the potential to realize an ultrasmall mode volume, which can improve sensitivity and lower loss. In addition, an ultrahigh Q/V ratio of 8.2 × 106 (λ/n)-3 and high resonance transmittance of T = 0.53 can be obtained through optimization analysis. After analyzing the trapping force and resonance shift caused by the change in local electric field, it is proven that our proposed cavity exhibits a high sensitivity and offers a convenient and stable method for particle sensing in water.
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Affiliation(s)
- Qi Cheng
- Measurement Technology and Instrumentation Key Lab of Hebei Province, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Shutao Wang
- Measurement Technology and Instrumentation Key Lab of Hebei Province, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Jiangtao Lv
- Northeastern University at Qinhuangdao, School of Control Engineering, Qinhuangdao 066004, People's Republic of China
| | - Junzhu Wang
- Measurement Technology and Instrumentation Key Lab of Hebei Province, Yanshan University, Qinhuangdao 066004, People's Republic of China
| | - Na Liu
- Measurement Technology and Instrumentation Key Lab of Hebei Province, Yanshan University, Qinhuangdao 066004, People's Republic of China
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Leonardi AA, Lo Faro MJ, Irrera A. Biosensing platforms based on silicon nanostructures: A critical review. Anal Chim Acta 2021; 1160:338393. [PMID: 33894957 DOI: 10.1016/j.aca.2021.338393] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 12/21/2022]
Abstract
Biosensors are revolutionizing the health-care systems worldwide, permitting to survey several diseases, even at their early stage, by using different biomolecules such as proteins, DNA, and other biomarkers. However, these sensing approaches are still scarcely diffused outside the specialized medical and research facilities. Silicon is the undiscussed leader of the whole microelectronics industry, and novel sensors based on this material may completely change the health-care scenario. In this review, we will show how novel sensing platforms based on Si nanostructures may have a disruptive impact on applications with a real commercial transfer. A critical study for the main Si-based biosensors is herein presented with a comparison of their advantages and drawbacks. The most appealing sensing devices are discussed, starting from electronic transducers, with Si nanowires field-effect transistor (FET) and porous Si, to their optical alternatives, such as effective optical thickness porous silicon, photonic crystals, luminescent Si quantum dots, and finally luminescent Si NWs. All these sensors are investigated in terms of working principle, sensitivity, and selectivity with a specific focus on the possibility of their industrial transfer, and which ones may be preferred for a medical device.
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Affiliation(s)
- Antonio Alessio Leonardi
- Dipartimento di Fisica e Astronomia "Ettore Majorana", Università di Catania, Via Santa Sofia 64, 95123, Catania, Italy; CNR-IMM UoS Catania, Istituto per La Microelettronica e Microsistemi, Via Santa Sofia 64, Italy; CNR-IPCF, Istituto per I Processi Chimico-Fisici, Viale F. Stagno D'Alcontres 37, 98158, Messina, Italy
| | - Maria José Lo Faro
- Dipartimento di Fisica e Astronomia "Ettore Majorana", Università di Catania, Via Santa Sofia 64, 95123, Catania, Italy; CNR-IMM UoS Catania, Istituto per La Microelettronica e Microsistemi, Via Santa Sofia 64, Italy
| | - Alessia Irrera
- CNR-IPCF, Istituto per I Processi Chimico-Fisici, Viale F. Stagno D'Alcontres 37, 98158, Messina, Italy.
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Surdo S, Duocastella M, Diaspro A. Nanopatterning with Photonic Nanojets: Review and Perspectives in Biomedical Research. MICROMACHINES 2021; 12:256. [PMID: 33802351 PMCID: PMC8000863 DOI: 10.3390/mi12030256] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 02/26/2021] [Accepted: 02/26/2021] [Indexed: 12/21/2022]
Abstract
Nanostructured surfaces and devices offer astounding possibilities for biomedical research, including cellular and molecular biology, diagnostics, and therapeutics. However, the wide implementation of these systems is currently limited by the lack of cost-effective and easy-to-use nanopatterning tools. A promising solution is to use optical methods based on photonic nanojets, namely, needle-like beams featuring a nanometric width. In this review, we survey the physics, engineering strategies, and recent implementations of photonic nanojets for high-throughput generation of arbitrary nanopatterns, along with applications in optics, electronics, mechanics, and biosensing. An outlook of the potential impact of nanopatterning technologies based on photonic nanojets in several relevant biomedical areas is also provided.
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Affiliation(s)
- Salvatore Surdo
- Nanoscopy, Istituto Italiano di Tecnologia, Via Enrico Melen 83, Building B, 16152 Genoa, Italy
| | - Martí Duocastella
- Nanoscopy, Istituto Italiano di Tecnologia, Via Enrico Melen 83, Building B, 16152 Genoa, Italy
- Department of Applied Physics, University of Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain
| | - Alberto Diaspro
- Nanoscopy, Istituto Italiano di Tecnologia, Via Enrico Melen 83, Building B, 16152 Genoa, Italy
- Department of Physics, University of Genoa, Via Dodecaneso 33, 16146 Genova, Italy
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