Article
Optics
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This paper presents a spectrometer design that surpasses the resolution-bandwidth limit, by tailoring the dispersion of mode splitting in a photonic molecule to identify spectral information at different free-spectral ranges (FSRs). Experimental results demonstrate that this approach can resolve arbitrary spectra with discrete, continuous, or hybrid features.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Review
Optics
Lichao Zhang, Jiamin Chen, Chaowei Ma, Wangzhe Li, Zhimei Qi, Ning Xue
Summary: Researchers have systematically reviewed the progress in on-chip FTSs, especially in on-chip static FTSs, focusing on theories, implementations, and performance indicators, to investigate the trade-off between reduced size and spectrometer performance.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Xiangzhe Zhang, Liqing Huang, Jingping Zhu, Ning Zhang, Kang Zong, Lipeng Zhai, Yu Zhang, Yakun Cai, Huimin Wang
Summary: The OPD equations of dual Wollaston prisms with an adjustable air gap are derived using the wave normal tracing method, and their validity is verified. The performance of a novel static birefringent Fourier transform imaging spectrometer based on these prisms is investigated.
Article
Optics
M. Capezzuto, D. D'Ambrosio, S. Avino, A. Giorgini, G. Gagliardi, P. Malara
Summary: In this study, a fast-scan optofluidic Fourier transform (FT) spectrometer on the tip of an optical fiber is demonstrated by stabilizing the evaporation dynamics of a microliter fluorocarbon droplet. Compared with other FT near-infrared (NIR) small-scale spectrometers reported in the literature, the fluorocarbon droplet spectrometer shows the largest wavelength span and span/resolution ratio, enabling easy spectral analysis of broadband or narrowband radiation. This opens up practical applications for droplet spectrometers as advanced optofluidic NIR analyzers with small size and low cost, capable of operating in harsh environments.
Article
Meteorology & Atmospheric Sciences
Qiang Guo, Jun Yang, Caiying Wei, Boyang Chen, Xin Wang, Changpei Han, Wen Hui, Weiwei Xu, Rui Wen, Yuning Liu
Summary: A complete spectrum calibration method for GIIRS/L1 products has been proposed, and preliminary assessments show good spectral and radiometric accuracies in both LW and MW bands. However, further development is needed for non-linearity correction of interferograms and spectral quality improvements.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Kyoung Min Yoo, Ray T. Chen
Summary: This paper proposes a novel spatial heterodyne Fourier transform spectrometer (SHFTS) that integrates a subwavelength grating coupler (SWGC) to overcome the limitations of bandwidth and resolution. The SWGC allows for dual-polarization bandpass sampling on the Si3N4 platform, enabling the reconstruction of each narrow-band channel without aliasing error or resolution degradation.
Article
Optics
Chunlei Sun, Chuyu Zhong, Maoliang Wei, Hui Ma, Ye Luo, Zequn Chen, Renjie Tang, Jialing Jian, Hongtao Lin, Lan Li
Summary: An innovative optical filter with FSR-free operation capability, subnanometer optical bandwidth, and acceptable fabrication tolerance has been demonstrated, showing great potential for large-capacity optical transmission and multiparameter sensing applications. By appropriately designing a specific structure of filter unit, a single deep dip within a wide bandwidth can be observed, and multiple units can be cascaded to achieve a multichannel filter.
PHOTONICS RESEARCH
(2021)
Article
Optics
Ang Li, Yeshaiahu Fainman
Summary: An ultra-high resolution Fourier transform spectrometer realized in a silicon photonic platform is reported, which can handle broad band, narrow band, as well as a combination of both signals. The high resolution is achieved by utilizing multiple techniques such as a Michelson interferometer structure, hybrid waveguide design, optimized heater, and air trenches. A novel multiple interferometers approach is employed to further increase the optical path delay of the spectrometer, leading to higher resolution.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Analytical
Zhixiong Yang, Kun Li, Chunchao Yu, Mingyao Yuan, Boyang Wang, Jie Feng
Summary: A temporally and spatially modulated long-wave infrared (LWIR)-imaging Fourier transform spectrometer was used to achieve hyperspectral imaging. This method enables rapid detection of hazardous gas leakage, ensuring personal safety.
Article
Physics, Multidisciplinary
Zhenhui Lin, Wei Miao, Ming Yao, Feng Wu, Qijun Yao, Bowen Fan, Boliang Liu, Shengcai Shi
Summary: The Ali CMB polarization telescope (AliCPT) in Tibet will conduct B-mode measurements to detect gravitational waves in the cosmic microwave background (CMB) radiation. Measurement results from three consecutive seasons using a Fourier transform spectrometer (FTS) show that the AliCPT site has a zenith median precipitable water vapor (PWV) as low as 1 mm, comparable to CMB B-mode measurement sites in the southern hemisphere such as Chile's Atacama Desert.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Optics
Qihang Chu, Xiaotian Li, Jirigalantu, Ci Sun, Jun Chen, Jianing Wang, Yuqi Sun, Bayanheshig
Summary: This paper presents a cross-dispersed spatial heterodyne spectrometer (CDSHS) that combines a spatial heterodyne spectrometer (SHS), a reflection grating, and a cylindrical lens. It provides expressions for the width, height, and location of the cross-dispersed interferograms corresponding to narrow spectral regions. A design example of CDSHS, including numerical simulations of the interferogram and the spectrum, is provided to illustrate the system. The results demonstrate that the CDSHS can simultaneously disperse different narrow spectral regions and obtain detailed spectra independently with a high signal-to-noise ratio, while maintaining advantages such as high resolution, high throughput, compactness, and zero moving parts. The CDSHS has great potential in applications such as multiple spectral feature measurement and weak spectral measurements.
Article
Optics
Xuemei Wang, Vineeth Sasidharan, Alexander Neumann, Payman Zarkesh-Ha, S. R. J. Brueck
Summary: An integrable on-chip spectrometer based on a transversely-chirped-grating waveguide coupler is demonstrated for the 400-700 nm visible spectral range. The spectrometer achieves a resolution of approximately 1.2 nm without any signal processing reconstruction.
Article
Instruments & Instrumentation
Luca Ciaffoni, Pavel Matousek, William Parker, Elin A. McCormack, Hugh Mortimer
Summary: This study presents a generic analytical model for comparing the detection performance of Raman spectrometers based on grating and spatial heterodyne designs. It shows that the SNR ratio between the two types of spectrometers can vary by two orders of magnitude, with spatial heterodyne spectrometers potentially competing with compact grating designs in delivering comparable detection performance in a much smaller footprint.
APPLIED SPECTROSCOPY
(2021)
Article
Optics
Muqian Wen, John Houlihan
Summary: Resampling by interpolation is a traditional method for processing interferograms from non-uniformly sampled Fourier transform spectrometers, while the non-uniform fast Fourier transform (NUFFT) is an overlooked alternative approach. Through experiments on a high-resolution interferometer and various optical sources, these two methods are compared. It is found that NUFFT is comparable to interpolation in spectral profile shape and spectral noise levels, but superior in spectral amplitude and computer performance. Moreover, a novel implementation of NUFFT is presented and analyzed.
OPTICS COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
Carter L. Rhea, Laurie Rousseau-Nepton, Simon Prunet, Julie Hlavacek-Larrondo, R. Pierre Martin, Kathryn Grasha, Natalia Vale Asari, Theophile Begin, Benjamin Vigneron, Myriam Prasow-Emond
Summary: In this series, machine learning is demonstrated to extract kinematic parameters and emission-line ratios from spectra with neural networks, and a new framework using a convolutional neural network for determining the number of line-of-sight components is developed. Results show that the neural network approach is more accurate and efficient compared to traditional methods, particularly in analyzing merging galaxy systems like NGC 2207/IC 2163.
ASTROPHYSICAL JOURNAL
(2021)
Article
Physics, Atomic, Molecular & Chemical
Christof Janssen, Corinne Boursier, Pascal Jeseck, Yao Te
JOURNAL OF MOLECULAR SPECTROSCOPY
(2016)
Article
Environmental Sciences
Felix R. Vogel, Matthias Frey, Johannes Staufer, Frank Hase, Gregoire Broquet, Irene Xueref-Remy, Frederic Chevallier, Philippe Ciais, Mahesh Kumar Sha, Pascale Chelin, Pascal Jeseck, Christof Janssen, Yao Te, Jochen Gross, Thomas Blumenstock, Qiansi Tu, Johannes Orphal
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2019)
Article
Meteorology & Atmospheric Sciences
Debra Wunch, Paul O. Wennberg, Gregory Osterman, Brendan Fisher, Bret Naylor, Coleen M. Roehl, Christopher O'Dell, Lukas Mandrake, Camille Viatte, Matthaeus Kiel, David W. T. Griffith, Nicholas M. Deutscher, Voltaire A. Velazco, Justus Notholt, Thorsten Warneke, Christof Petri, Martine De Maziere, Mahesh K. Sha, Ralf Sussmann, Markus Rettinger, David Pollard, John Robinson, Isamu Morino, Osamu Uchino, Frank Hase, Thomas Blumenstock, Dietrich G. Feist, Sabrina G. Arnold, Kimberly Strong, Joseph Mendonca, Rigel Kivi, Pauli Heikkinen, Laura Iraci, James Podolske, PatrickW. Hillyard, Shuji Kawakami, Manvendra K. Dubey, Harrison A. Parker, Eliezer Sepulveda, Omaira E. Garcia, Yao Te, Pascal Jeseck, Michael R. Gunson, David Crisp, Annmarie Eldering
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2017)
