Dr. Xingchen Dong Profile

Dr. Xingchen Dong

at Technische Univ München

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Author

Publications (7)

Proceedings Article | 5 March 2021 Presentation + Paper

Optical fiber sensors based on multimode interference using square-core fiber for temperature measurement

Xingchen Dong, Michael Köhler, Patrick Kienle, Qiang Bian, Martin Jakobi, Alexander Koch, Maximilian Fink, Kun Wang

Proceedings Volume 11693, 116930R (2021) https://doi.org/10.1117/12.2577571

KEYWORDS: Fiber optics sensors, Multimode fibers, Temperature metrology, Structured optical fibers, Single mode fibers, Sensors, Multimode interference devices, Fusion splicing, Brain-machine interfaces, Cladding

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Proceedings Article | 20 September 2020 Presentation + Paper

Compact static Fourier transform spectrometer for time-resolved mid-infrared spectroscopy

Michael Köhler, Bastian Vauth, Clara Kiesselbach, Xingchen Dong, Kun Wang, Patrick Kienle, Carsten Giebeler, Benjamin Wiesent, Alexander Koch, Michael Schardt

Proceedings Volume 11537, 1153707 (2020) https://doi.org/10.1117/12.2571489

KEYWORDS: Spectroscopy, Mid-IR, Fourier transforms, Time resolved spectroscopy, Spectral resolution, Light sources, FT-IR spectroscopy, Fourier optics, Signal to noise ratio, Mirrors

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Proceedings Article | 20 August 2020 Poster + Paper

Line-scan hyperspectral imaging microscopy with structured illumination

Kun Wang, Xingchen Dong, Zhendong Li, Jie Dong, Michael Köhler, Martin Jakobi, Alexander Koch

Proceedings Volume 11508, 115080U (2020) https://doi.org/10.1117/12.2565944

KEYWORDS: Hyperspectral imaging, Microscopy, Microscopes, Line scan image sensors, Spatial resolution, Phase shifts, Digital Light Processing, Control systems

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Proceedings Article | 30 March 2020 Presentation + Paper

Mapping the optical dielectric response of isolated monolayer MoS2 by push-broom microspectroscopy

Xingchen Dong, Michael Köhler, Kun Wang, Martin Jakobi, Alexander Koch

Proceedings Volume 11351, 113511I (2020) https://doi.org/10.1117/12.2540501

KEYWORDS: Dielectrics, Imaging spectroscopy, Molybdenum, Refractive index, Reflectivity, Light-matter interactions, Optical properties, Spectroscopy, Hyperspectral imaging, Microscopy

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Two-dimensional van der Waals materials are attractive for photonics and optoelectronics due to distinctive layerdependent optical properties. Optical properties based on light-matter interactions have been revealed by modern imaging and spectroscopy techniques. Hyperspectral imaging microscopy working in line-scan mode (push-broom microspectroscopy) can provide abundant spectral information covering a large area compared to conventional spectroscopy techniques, with a higher acquisition speed than point-scan techniques such as atomic force microscopy and Raman imaging microscopy. This contribution studies in-depth the reconstruction of 3D datacubes and the extraction of optical responses of the sample. Monolayer MoS₂, a subclass of semiconducting two-dimensional materials, is fabricated by the mechanical exfoliation method on the SiO₂/Si substrate with an oxide thickness of 285 nm. The isolated monolayer MoS₂ is observed and identified by a conventional optical microscope. The custom-built push-broom microspectroscope is utilized to scan the region of interest, with the whole spectrum of every line recorded at each frame. The spectral information of every point is collected and 3D spectral data sets are reconstructed for feature extraction and property analysis. To realize the thickness mapping of flakes, linear unmixing is employed to calculate the abundance of isolated monolayer MoS₂ on the SiO₂/Si substrate, improving flake identification performances. The characteristic spectrum of monolayer MoS₂ is acquired by averaging the spectrum from the monolayer MoS₂ flake. Furthermore, the optical dielectric response is further analyzed by Kramers-Kronig constrained analysis and Fresnel-law-based analysis. The optical dielectric function is calculated and compared based on the refractive index and medium thickness. This detailed analysis of optical dielectric responses highlights the feasibility of push-broom microspectroscopy for two-dimensional materials characterization.

Proceedings Article | 3 September 2019 Paper

Static Fourier transform mid-infrared spectrometer with continuous background correction

Michael Köhler, Michael Schardt, Hamza Ghazala, Patrick Kienle, Kun Wang, Alexander Koch, Xingchen Dong, Ennio Colicchia

Proceedings Volume 11102, 1110218 (2019) https://doi.org/10.1117/12.2528404

KEYWORDS: Mirrors, Spectroscopy, Sensors, Fourier transforms, FT-IR spectroscopy, Beam splitters, Light sources, Off axis mirrors, Interferometers, Transmittance

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Proceedings Article | 21 June 2019 Presentation + Paper

Hyperspectral imaging microscopy for thickness measurement and surface characterization of layered MoS2

Martin Jakobi, Alexander Koch, Xingchen Dong, Michael Köhler

Proceedings Volume 11056, 110561S (2019) https://doi.org/10.1117/12.2530384

KEYWORDS: Molybdenum, Hyperspectral imaging, Microscopes, Imaging spectroscopy, Imaging systems, Light emitting diodes

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Proceedings Article | 21 June 2019 Paper

Setup and evaluation of a static imaging Fourier transform spectrometer for the mid-infrared spectral range

Michael Köhler, Patrick Kienle, Xingchen Dong, The Thien Nguyen, Alexander Koch

Proceedings Volume 11056, 110561P (2019) https://doi.org/10.1117/12.2525600

KEYWORDS: Spectroscopy, Fourier transforms, Light sources, Detector arrays, Interferometers, Beam splitters, Sensors, Spectral resolution, Mirrors, Imaging systems

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Showing 5 of 7 publications

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