Dr. Xiangying Deng Profile

Dr. Xiangying Deng

SPIE Involvement:

Editorial Board Member: Optical Engineering | Author

Publications (2)

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SPIE Journal Paper | 8 September 2023 Open Access

Graphene-based midinfrared photodetector with bull’s eye plasmonic antenna

Xiangying Deng, Shunri Oda, Yukio Kawano

OE, Vol. 62, Issue 09, 097102, (September 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.9.097102

KEYWORDS: Graphene, Antennas, Eye, Plasmonics, Photodetectors, Electrodes, Photocurrent, Terahertz radiation, Surface plasmon polaritons, Fabrication

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The spectral region of midinfrared has proven its great potential in various fields, such as materials characterization, medical examination, security, and product inspection. However, the development of room-temperature sensitive midinfrared photodetectors is inevitably in strong demand. Graphene-based detectors are expected to potentially overcome many of the shortcomings of earlier detectors. Unfortunately, low light absorption originating from a single atomic layer is still an obstacle for sensitive sensing using graphene-based photodetectors. To optimize the performance of plasmonic antenna, we have proposed wideband bull’s-eye-shaped antennas using cavity-mode resonance for the midinfrared region. The proposed multi-resonant frequency plasmonic antennas are integrated with graphene-based detectors for midinfrared detection. We demonstrated that the graphene device integrated with the multifrequency plasmonic antenna enabled the room-temperature sensitive midinfrared detection. In addition, such a device can achieve frequency filtering measurement through the bull’s eye shaped plasmonic antenna. The coupling of antenna onto the device largely spares the integration space. We believe that such a device is practical in various applications that require room-temperature, frequency selective sensitive photo detection.

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SPIE Journal Paper | 18 June 2018

Surface plasmon polariton graphene midinfrared photodetector with multifrequency resonance

Xiangying Deng, Yukio Kawano

JNP, Vol. 12, Issue 02, 026017, (June 2018) https://doi.org/10.1117/12.10.1117/1.JNP.12.026017

KEYWORDS: Eye, Graphene, Antennas, Photodetectors, Plasmonics, Surface plasmon polaritons, Sensors, Terahertz radiation, Electrodes, Absorption

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Midinfrared spectrum region has proved its great potential in various fields including security, medical examination, product inspection, and materials characterization. However, midinfrared detectors, one of the most important components, have not been fully developed and their performance can be much improved. In contrast to well-known nanostructured semiconductor detectors, graphene-based detectors are emerging and are proposed to tackle shortcomings of earlier detectors. Nevertheless, they still suffer from obstacles due to low light absorption originating from a single atomic layer. Recently, the introduction of plasmonic antennas is changing the situation and is attracting much interest. We present a midinfrared photodetector based on a multiresonant frequency bull’s eye antenna coupled with monolayer graphene. The bull’s eye antenna is one of the plasmonic antennas that can achieve high concentration of electric field and enhanced transmission of incident light. Though conventional bull’s eye antennas exhibit only single resonant frequency that restricts to a measured frequency range, we here designed and fabricated the bull’s eye antenna with wider band transmission so that various frequency regions can be studied with a single device. We demonstrated that the graphene device integrated with the multifrequency plasmonic antenna enabled the room-temperature midinfrared detection, together with the ability of frequency filtering in a desirable band. Our device design is also applicable to other frequency regions including visible light and terahertz waves by adjusting structural parameters.

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