Article
Engineering, Electrical & Electronic
Lingyi Xu, Jianjun Lai, Shaowu Wang, Changhong Chen, Lirong Huang, Chaoming Wang, Sicheng Zhong, Yihua Gao
Summary: Simultaneously identifying the composition of mixtures and determining their concentration levels has gained much attention. In this work, a design method for multichannel metasurface infrared array optics for integrated infrared gas sensors was proposed. The use of metasurface microstructures with the same height enables effective filtering and focusing of electromagnetic waves at multiple wavelengths in both infrared bands. The multichannel metasurface infrared optics have the advantages of easy fabrication and integration with wideband infrared detector array, meeting the requirements of small volume and low cost for advanced infrared spectral sensors.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Fuyong Yue, Riccardo Piccoli, Mikhail Y. Shalaginov, Tian Gu, Kathleen A. Richardson, Roberto Morandotti, Juejun Hu, Luca Razzari
Summary: This research demonstrates the possibility of enhancing third-harmonic generation (THG) in the mid-wave infrared (MWIR) range through designing a metasurface, with a 30-fold enhancement achieved using a highly nonlinear material Ge2Sb2Se4Te1 (GSST). GSST-based metasurfaces offer unprecedented broadband transparency, large refractive index, high nonlinear response, and unique phase-change properties, making them an attractive solution for reconfigurable and ultra-compact nonlinear devices operating in the MWIR.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Kai Guo, Xiaoyu Li, Huifang Ai, Xiya Ding, Lulu Wang, Wei Wang, Zhongyi Guo
Summary: This study presents a design of a metasurface with a phase change material that can dynamically focus and deflect a beam at a wavelength of 8.5 μm. The focusing and deflection characteristics of the metasurface are manipulated by controlling the crystalline fraction of the material. This method provides a new route for tunable optical communication devices by increasing the degree of freedom of active modulation.
RESULTS IN PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Benjamin J. Russell, Jiajun Meng, Kenneth B. Crozier
Summary: Mid-infrared spectroscopy enables nondestructive and real-time chemical identification. To meet the demand for in situ sensing, novel sensing technologies have been developed that minimize size, weight, power, and cost. These technologies include mid-IR microspectrometers that interface a detector array with an array of discrete spectral filters. The study explores the use of all-dielectric, single-layer, coupled waveguide-grating structures as filters in a filter-array detector-array spectrometer, and predicts accurate classification of common acyclic hydrocarbons and detection of single-gas down to low concentrations.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Michael Barrow, Jamie Phillips
Summary: The high-Q resonances observed in subwavelength gratings have various applications and can be integrated with active devices, opening new possibilities for microscale optical systems.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Samir Rosas, Keegan A. Schoeller, Edward Chang, Hongyan Mei, Mikhail A. Kats, Kevin W. Eliceiri, Xinyu Zhao, Filiz Yesilkoy
Summary: Label-free and nondestructive mid-infrared vibrational hyperspectral imaging is an important tissue analysis tool that provides spatially resolved biochemical information. This study introduces an advanced mid-infrared spectrochemical tissue imaging modality using metasurfaces to capture quantitative molecular maps of large-area murine brain tissue sections. The results demonstrate that plasmonic metasurfaces enhance chemical contrast in infrared images and enable the detection of ultrathin tissue regions. This imaging method has the potential to have a broad impact on translational research and clinical histopathology.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Haiming Yu, Jilei Chen, Vincent Cros, Paolo Bortolotti, Hanchen Wang, Chenyang Guo, Florian Brandl, Florian Heimbach, Xiufeng Han, Abdelmadjid Anane, Dirk Grundler
Summary: Electromagnetic metasurfaces, created by arranging elements with dimensions below the wavelength, can modulate a material's response to electromagnetic waves. This study reports the use of ferromagnetic metasurfaces to manipulate the transmission of spin waves in thin ferrimagnetic insulators. The efficiency of the metasurface is demonstrated to be 98.5%, with potential applications in on-chip control of microwaves.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Environmental Sciences
Shuowen Yang, Hanlin Qin, Xiang Yan, Shuai Yuan, Qingjie Zeng
Summary: A novel mid-wave infrared snapshot compressive spectral imager (MWIR-SCSI) is proposed, which can reconstruct image information and perform spectral correction effectively. A deep infrared denoising prior plug-in is designed for optimization using deep learning algorithms. Experimental results demonstrate the effectiveness of the designed plug-in and the proposed acquisition architecture.
Article
Materials Science, Multidisciplinary
Dandan Yuan, Jun Li, Jiaxu Huang, Min Wang, Shaolin Xu, Xinwei Wang
Summary: Large-scale nanopatterning is crucial for the practical applications of metasurfaces, and phase-change materials have attracted significant attention for their tunable function and high absorption performance. In this study, an efficient method combining ultrafast laser modification and subsequent etching was developed to fabricate nanostructures on a phase-change material, Ge2Sb2Te5 (GST), over a wafer-sized area. The size and period of the nanostructures can be tuned by adjusting laser parameters and etching conditions. The fabricated metasurface absorber using GST as resonators achieved dual-band and tri-band absorption peaks in the mid-infrared range, with a peak absorptivity of approximately 92%. By converting GST from amorphous to crystalline state, a broad absorption spectral redshift of 700 nm was achieved.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Chenning Tao, Huanzheng Zhu, Yusheng Zhang, Si Luo, Qiang Ling, Bin Zhang, Zhangwei Yu, Xiao Tao, Daru Chen, Qiang LI, Zhenrong Zheng
Summary: This paper proposes a single-pixel spectral imaging system for shortwave infrared (SWIR) using a phase-change metasurface. By varying the crystallinity of the metasurface, the transmittance spectra can be tuned, enabling spectral modulation. The spectral modulations allow for compressive sampling on the spectral domain of SWIR hyperspectral images. Additionally, the optimization of the phase-change metasurface through coherence minimization is demonstrated. The concept of spectral modulation with phase-change metasurface overcomes limitations in conventional modulators and opens up possibilities for high-efficiency, low-cost, and miniaturized computational imaging based on nanophotonics.
Article
Chemistry, Multidisciplinary
Yoshiaki Nishijima, Saulius Juodkazis
Summary: This study demonstrates a method to control the coupling between molecular mid-infrared absorption/emission and a metasurface using SiO2 as an absorber/emitter and CaF2 as a spacer. The use of inorganic dielectric I-spacers in metal-insulator-metal (MIM) metasurfaces opens up applications for narrow-band emitters in the mid-infrared spectral window at high temperatures (>350 degrees C), where polymer/organic I-spacers degrade.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Optics
Tongtong Kang, Boyu Fan, Jun Qin, Weihao Yang, Shuang Xia, Zheng Peng, Bo Liu, Sui Peng, Xiao Liang, Tingting Tang, Longjiang Deng, Yi Luo, Hanbin Wang, Qiang Zhou, Lei Bi
Summary: This study reports a mid-infrared active metasurface based on Si/VO2 hybrid meta-atoms, which demonstrates different modulation amplitudes of the electric or magnetic resonance scattering cross sections by incorporating VO2 thin films in different locations. The research highlights the potential importance of this active metasurface for mid-infrared photonic applications.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Li Lu, Zhaogang Dong, Febiana Tijiptoharsono, Ray Jia Hong Ng, Hongtao Wang, Soroosh Daqiqeh Rezaei, Yunzheng Wang, Hai Sheng Leong, Poh Chong Lim, Joel K. W. Yang, Robert E. Simpson
Summary: Dielectric optical nanoantennas offer reversible tunability of Mie resonances in the visible spectrum by exploiting phase transitions in Sb2S3 nanodiscs. This design has potential applications in high-resolution color displays, holographic displays, and miniature LiDAR systems.
Article
Chemistry, Multidisciplinary
Li Lu, Zhaogang Dong, Febiana Tijiptoharsono, Ray Jia Hong Ng, Hongtao Wang, Soroosh Daqiqeh Rezaei, Yunzheng Wang, Hai Sheng Leong, Poh Chong Lim, Joel K. W. Yang, Robert E. Simpson
Summary: Dielectric optical nanoantennas have the potential to reversibly tune Mie resonances in the visible spectrum, enabling color switching in structural colors. The phase transitions in Sb2S3 nanodiscs allow for tunability, which is important for the development of high-resolution color displays, holographic displays, and miniature LiDAR systems.
Article
Optics
Yujie Cai, Yu Chen, Xiaoning Xin, Kun Huang, E. Wu
Summary: This study demonstrates a broadband mid-infrared (MIR) single-photon frequency upconversion spectroscopy method. By utilizing the temporal-spectral quantum correlation of non-degenerate photon pairs, the signal is extracted from the noise caused by strong pump, achieving single-photon-level MIR spectral measurement. The system features non-destructive and robust operation, making it an appealing option for biochemical applications.
PHOTONICS RESEARCH
(2022)
Article
Optics
George S. D. Gordon, James Joseph, Travis Sawyer, Alexander J. Macfaden, Calum Williams, Timothy D. Wilkinson, Sarah E. Bohndiek
Article
Optics
M. N. Julian, M. C. Gupta
OPTICS AND LASERS IN ENGINEERING
(2020)
Article
Optics
Calum Williams, Nina Hong, Matthew Julian, Stephen Borg, Hyun Jung Kim
Article
Optics
Travis W. Sawyer, Michaela Taylor-Williams, Ran Tao, Ruqiao Xia, Calum Williams, Sarah E. Bohndiek
Summary: Multispectral imaging is widely used in various applications, and multispectral filter arrays (MSFAs) play a crucial role in cost-effective and compact snapshot multispectral imaging. However, there are limitations in the current design and optimization methods for MSFAs. This article presents Opti-MSFA, a Python-based toolbox that offers centralized design and optimization of MSFAs, incorporating advanced spectral-spatial optimization algorithms and supporting user-defined datasets.
Article
Nanoscience & Nanotechnology
Sensong An, Bowen Zheng, Matthew Julian, Calum Williams, Hong Tang, Tian Gu, Hualiang Zhang, Hyun Jung Kim, Juejun Hu
Summary: This paper proposes a deep learning approach for forward modeling and inverse design of photonic devices. By combining neural network design of metasurfaces with scattering matrix-based optimization, the computational overhead is significantly simplified while achieving accurate objective-driven design.
Article
Biochemical Research Methods
Michaela Taylor-Williams, Stephen Mead, Travis W. Sawyer, Lina Hacker, Calum Williams, Michael Berks, Andrea Murray, Sarah E. Bohndiek
Summary: This study designed, constructed, and tested a low-cost multispectral imaging system using LED illumination to assess relative hemoglobin oxygenation in the nailfold capillaries. The results demonstrated that LED-based illumination could be used as a low-cost approach to enable multispectral imaging of the nailfold capillaries to provide insight into the oxygenation of the blood contained within the capillary network.
JOURNAL OF BIOMEDICAL OPTICS
(2022)
Proceedings Paper
Optics
Ning Xu, Calum Williams, Graham Spicer, Sarah E. Bohndiek, Qiaofeng Tan
Summary: Optical endoscopy is essential for minimally-invasive medical diagnostics, and real-time zoom functionality is desirable for improving diagnostic accuracy. However, existing chip-on-tip endoscopes face challenges in achieving this functionality. In this work, we demonstrate a diffractive optical element (DOE) based optical imaging system that enhances spatial resolution without mechanical scanning.
ADVANCED OPTICAL IMAGING TECHNOLOGIES V
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Calvin M. Hooper, Sarah E. Bohndiek, Calum Williams
Summary: Metalenses are ultrathin optical devices that use nanoscale resonant structures to redirect light. Achieving achromaticity in metalens design has proven challenging, but a thin-film multilayer design can serve as an alternative for achromatic metalenses.
HIGH CONTRAST METASTRUCTURES XI
(2022)
Proceedings Paper
Engineering, Biomedical
Michaela Taylor-Williams, Richard Cousins, Calum Williams, Sarah E. Bohndiek, Christopher J. Mellor, George S. D. Gordon
Summary: This study presents a method for designing and fabricating 'HyperPixels' that have custom spectral transmission properties for efficient imaging of specific chromophores or fluorophores. The proposed method improves signal to noise ratio and reduces the complexity of software or hardware processing.
OPTICAL BIOPSY XX: TOWARD REAL-TIME SPECTROSCOPIC IMAGING AND DIAGNOSIS
(2022)
Article
Optics
Hyun Jung Kim, Jung-woo Sohn, Nina Hong, Calum Williams, William Humphreys
Summary: The article discusses the application of chalcogenide glass phase change materials in nanophotonic devices, and introduces an online database PCM-net for sharing experimental and computational data to aid researchers in optimizing device design and promoting collaborative research efforts within the PCM community.
JOURNAL OF PHYSICS-PHOTONICS
(2021)
Article
Chemistry, Physical
Christian Kuppe, Xuezhi Zheng, Calum Williams, Alexander W. A. Murphy, Joel T. Collins, Sergey N. Gordeev, Guy A. E. Vandenbosch, Ventsislav K. Valev
NANOSCALE HORIZONS
(2019)