High-responsivity plasmonics-based GaAs metal-semiconductor-metal photodetectors

作者：Karar Ayman^*; Das Narottam; Tan Chee Leong; Alameh Kamal; Lee Yong Tak; Karouta Fouad

来源：Applied Physics Letters, 2011, 99(13): 133112.

DOI：10.1063/1.3625937

• finite difference time-domain analysis
• gallium arsenide
• metal-semiconductor-metal structures
• nanostructured materials
• photoconductivity
• photodetectors
• plasmonics
• surface plasmons

We report the experimental characterization of high-responsivity plasmonics-based GaAs metal-semiconductor-metal photodetector (MSM-PD) employing metal nano-gratings. Both the geometry and light absorption near the designed wavelength are theoretically and experimentally investigated. The measured photocurrent enhancement is 4-times in comparison with a conventional single-slit MSM-PD. We observe reduction in the responsivity as the bias voltage increases and the input light polarization varies. Our experimental results demonstrate the feasibility of developing a high-responsivity, low bias-voltage high-speed MSM-PD.

• 出版日期2011-9-26