Yijun Huang

Giant bulk photovoltaic effect in an iron-based magnetic semiconductor

Mingliang Cheng, Zheng Wang, Jingyu Ji, Jianzhao Wang et autres

Abstract Efficient bulk photovoltaic (BPV) conversion and room-temperature ferromagnetism are difficult to combine, because the itinerant electrons that support magnetic order favor metallic transport, whereas BPV generation requires a semiconducting state with broken inversion symmetry. Here, we show that oxygen-plasma implantation transforms …

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Dual slow-light enhanced photothermal gas spectroscopy on a silicon chip

Kaiyuan Zheng, Hanyu Liao, Yijun Huang, Haihong Bao et autres

Integrated photonic sensors have attracted significant attention recently for their potential for high-density integration. However, they face challenges in sensing gases with high sensitivity due to weak light-gas interaction. Slow light, which dramatically intensifies light-matter interaction through spatial compression of optical energy, …

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Slow-Light-Enhanced Polarization Division Multiplexing Infrared Absorption Spectroscopy for On-Chip Wideband Multigas Detection in a 1D Photonic Crystal Waveguide

Zihang Peng, Yijun Huang, Kaiyuan Zheng, Yuting Min et autres

Slow-light photonic crystal waveguide (PCW) gas sensors based on infrared absorption spectroscopy play a pivotal role in enhancing the on-chip interaction between light and gas molecules, thereby significantly boosting sensor sensitivity. However, two-dimensional (2D) PCWs are limited by their narrow mode bandwidth …

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Waveguide‐Based On‐Chip Photothermal Spectroscopy for Gas Sensing

Kaiyuan Zheng, Mingquan Pi, Yijun Huang, Zihang Peng et autres

Abstract On‐chip waveguide spectroscopic sensors have attracted considerable attention due to its potential for large‐scale integration. However, existing waveguide gas sensors based on direct absorption spectroscopy (DAS) suffer from limited sensitivity and measurement range. Here waveguide‐based on‐chip photothermal spectroscopy (PTS) is demonstrated …

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Mid-infrared auto-correction on-chip waveguide gas sensor based on 2f/1f wavelength modulation spectroscopy

Mingquan Pi, Chuantao Zheng, Huan Zhao, Jialin Ji et autres

Compared to the most commonly used on-chip direct absorption spectroscopy (DAS) gas detection technique, the second harmonic (2 f ) based on-chip wavelength modulation spectroscopy (WMS) proposed by our group has the faculty to suppress noise and improve performance, but the accuracy …

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Theoretical and experimental investigation of chalcogenide suspended waveguide gas sensor

Yijun Huang, Xueying Wang, Mingquan Pi, Huan Zhao et autres

Abstract To address the issues of low ratio of evanescent field (γ) and high reflectivity between waveguide cross‐section and gas for the mid‐infrared waveguide sensors, we propose a chalcogenide (ChG) suspended waveguide with Ge28Sb12Se60 as the core layer and silica (SiO2) as …

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Slow-light-enhanced on-chip 1D and 2D photonic crystal waveguide gas sensing in near-IR with an ultrahigh interaction factor

Zihang Peng, Yijun Huang, Kaiyuan Zheng, Chuantao Zheng et autres

Nanophotonic waveguides hold great promise to achieve chip-scale gas sensors. However, their performance is limited by a short light path and small light–analyte overlap. To address this challenge, silicon-based, slow-light-enhanced gas-sensing techniques offer a promising approach. In this study, we experimentally investigated …

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Ultra-Wideband Mid-Infrared Chalcogenide Suspended Nanorib Waveguide Gas Sensors with Exceptionally High External Confinement Factor beyond Free-Space

Mingquan Pi, Chuantao Zheng, Huan Zhao, Zihang Peng et autres

On-chip waveguide sensors are potential candidates for deep-space exploration because of their high integration and low power consumption. Since the fundamental absorption of most gas molecules exists in the mid-infrared (e.g., 3–12 μm), it is of great significance to fabricate wideband mid-infrared …

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Performance improvement of on-chip mid-infrared waveguide methane sensor using wavelet denoising and Savitzky-Golay filtering

Jialin Ji, Yijun Huang, Mingquan Pi, Huan Zhao et autres

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Mid-infrared chalcogenide slot waveguide plasmonic resonator sensor embedded with Au nanorods for surface-enhanced infrared absorption spectroscopy

Mingquan Pi, Huan Zhao, Chunguang Li, Yuting Min et autres

The problem of a traditional waveguide plasmonic resonator sensor is that part of the near-field intensity enhanced area is confined in the waveguide dielectric layer, which decreases the interaction effect between light and analyte. In order to solve this problem, a novel …

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Theoretical and experimental investigation of on-chip mid-infrared chalcogenide waveguide CH4 sensor based on wavelength modulation spectroscopy

Mingquan Pi, Yijun Huang, Huan Zhao, Zihang Peng et autres

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Double‐slot subwavelength grating waveguide for on‐chip carbon dioxide sensing

Jiaming Lang, Mingquan Pi, Huan Zhao, Zihang Peng et autres

Abstract A novel double‐slot subwavelength grating with high sensitivity and small size was presented for the detection of carbon dioxide (CO2). Compared with single‐slot structure, the proposed double‐slot structure reduces the influence of slot width on the transmission intensity and thus improves …

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