Miniaturizing a Chip-Scale Spectrometer Using Local Strain Engineering and Total-Variation Regularized Reconstruction

Sarwar, Tuba; Yaras, Can; Li, Xiang; Qu, Qing; Ku, Pei-Cheng

doi:10.1021/acs.nanolett.2c02654

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…The building block for these detectors is a nanopillar-shaped GaN light-emitting diode (LED) but left biased such that the active region can absorb light and generate photocurrent. The nanopillar LED's size (diameter) and shape can be designed to change the detector's spectral responsivity [2]. As a result, the input optical signal is encoded differently by different photodetectors.…”

Section: Device Designmentioning

confidence: 99%

“…Computation spectroscopy has emerged as a powerful technique to miniaturize a conventionally bulky spectrometer system [1]. This work proposes a compact chip-scale spectropolarimeter based on reconstructive algorithms and local strain engineering in gallium nitride (GaN) semiconductor nanostructures [2]. While a spectrometer measures an optical signal's intensity, a spectropolarimeter can obtain extra information, such as the electric field's polarization and phase.…”

Section: Introductionmentioning

confidence: 99%

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UV-VIS chip-scale spectropolarimeter

Kim,

Chen,

et al. 2024

Next-Generation Spectroscopic Technologies XVI

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An on-chip spectropolarimeter is proposed based on gallium nitride polarization and spectral encoders. Polarization encoding is achieved via local strain engineering and valence-band mixing induced by asymmetric strain relaxation. Broadband polarization-sensitive photodetectors can replace linear polarizers to enable chip-scale implementation of a spectropolarimeter with the help of computational reconstructive algorithms.

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Section: Device Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UV-VIS chip-scale spectropolarimeter

Kim,

Chen,

et al. 2024

Next-Generation Spectroscopic Technologies XVI

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Advances in Miniaturized Computational Spectrometers

Xue,

Yang,

et al. 2024

Advanced Science

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Miniaturized computational spectrometers have emerged as a promising strategy for miniaturized spectrometers, which breaks the compromise between footprint and performance in traditional miniaturized spectrometers by introducing computational resources. They have attracted widespread attention and a variety of materials, optical structures, and photodetectors are adopted to fabricate computational spectrometers with the cooperation of reconstruction algorithms. Here, a comprehensive review of miniaturized computational spectrometers, focusing on two crucial components: spectral encoding and reconstruction algorithms are provided. Principles, features, and recent progress of spectral encoding strategies are summarized in detail, including space‐modulated, time‐modulated, and light‐source spectral encoding. The reconstruction algorithms are classified into traditional and deep learning algorithms, and they are carefully analyzed based on the mathematical models required for spectral reconstruction. Drawing from the analysis of the two components, cooperations between them are considered, figures of merits for miniaturized computational spectrometers are highlighted, optimization strategies for improving their performance are outlined, and considerations in operating these systems are provided. The application of miniaturized computational spectrometers to achieve hyperspectral imaging is also discussed. Finally, the insights into the potential future applications and developments of computational spectrometers are provided.

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Optical spectrum analyzers and typical applications in astronomy and remote sensing

Yan,

Chen,

Yang

et al. 2023

Review of Scientific Instruments

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Scientists are increasingly relying on astronomical and remote sensing technologies to gain deeper insights into the Earth and the universe. In these fields, the optical spectrum analyzer (OSA) or spectrometer plays a pivotal role. This Review offers a comprehensive overview of the fundamental principles, key parameters, and applications of various branches of traditional OSAs, including prisms, gratings, interferometers, tunable filters, and reconstructive spectrometers. We specifically focus on their latest major applications in astronomy and remote sensing. Additionally, we present a mathematical model of the generalized reconstructive spectrometer and provide a summary of its principles pertaining to spectral mapping, reconstruction, and imaging. Despite its limited aperture and étendue, the reconstructive spectrometer holds great potential for future use in astronomy and remote sensing due to its compact size and exceptional ultrahigh spectral resolution.

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Miniaturizing a Chip-Scale Spectrometer Using Local Strain Engineering and Total-Variation Regularized Reconstruction

Cited by 9 publications

References 30 publications

UV-VIS chip-scale spectropolarimeter

UV-VIS chip-scale spectropolarimeter

Advances in Miniaturized Computational Spectrometers

Optical spectrum analyzers and typical applications in astronomy and remote sensing

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