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Takayuki Kurashina

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Proceedings Article | 15 March 2023 Presentation + Paper

Development of room-temperature-operated InAsSb linear sensors with ROIC for 7-10 µm detection

Chihiro Suzuki, Hiroo Yamamoto, Daisuke Iida, Takayuki Kurashina, Yoshihisa Warashina

Proceedings Volume 12430, 124300S (2023) https://doi.org/10.1117/12.2650623

KEYWORDS: Image sensors, Resistance, Dark current, Quantum cascade lasers, Mid-IR, Signal to noise ratio, Readout integrated circuits, Pulse signals, Photodiodes, Photodetectors

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A 128-channel linear array photodetector, with 25 μm pixel pitch, connected to a readout integrated circuit (ROIC) was developed for mid-infrared spectroscopic applications that use a wavelength-variable quantum cascade laser (QCL). The detector is composed of III-V semiconductor InAsSb, has sensitivity in the mid-infrared region, and is operated at room temperature. The photovoltaic type of MIR detectors has a low shunt resistance, which causes high dark current. Therefore, a multi-series detector, which has a high total shunt resistance, is generally used for uncooled operation. However, in our newly developed detector array, a single element is employed as each channel’s detector to achieve high signal sensitivity. Also, a DC feedback (DCFB) mechanism is applied to the ROIC to draw out the detector’s high dark current. The detector’s performance is evaluated using a pulsed QCL with an emission wavelength of 7-10 μm at room temperature. A reverse voltage is applied to the detector to improve the detector’s characteristics and allow it to respond to a QCL’s pulse width of 100 nsec. Although the reverse voltage increases the detector’s dark current, the DC feedback draws out the dark current up to 1 mA. The detector’s sensitivity is 1.5 A/W at 7 μm, the TIA’s gain is designed to be 1k ohm, so the total trans gain obtained is 1.5 V/mW. The detector’s noise input equivalent power is 200 nW. Therefore, a high signal-to-noise ratio can be achieved because the pulsed QCL can output a peak power higher than several tens of milliwatts.

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