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29 September 2017 Hybrid cavity for photo-conductive detectors with nanoantenna arrays and distributed Bragg reflectors (Conference Presentation)
Oleg Mitrofanov
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Proceedings Volume 10353, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017; 103530J (2017) https://doi.org/10.1117/12.2275566
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States
Abstract
Efficiency of photoconductive detectors is limited by the bulk optical properties of photoconductive materials. The absorption length is on the order of several hundred nanometers, which limits the device thickness. Optical absorption however in the photoconductive layer can be modified substantially by using the concept of hybrid cavity, which consists of nanoantennas and a Distributed Bragg Reflector. A hybrid cavity containing a GaAs photoconductive layer of just 50 nm can be used to absorb >75% of incident photons by trapping the light within the cavity. We will discuss an intuitive model, which describes the dependence of the optimum operation wavelength on the cavity thickness. We will also show that the nanoantenna size is a critical parameter, small variations of which lead to both wavelength shifting and reduced absorption in the cavity. This behavior suggests that impedance matching is key for achieving efficient absorption in the hybrid cavities.
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Oleg Mitrofanov "Hybrid cavity for photo-conductive detectors with nanoantenna arrays and distributed Bragg reflectors (Conference Presentation)", Proc. SPIE 10353, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017, 103530J (29 September 2017); https://doi.org/10.1117/12.2275566
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KEYWORDS
Absorption
Sensors
Distributed Bragg reflectors
Imaging systems
Infrared sensors
Gallium arsenide
Optical properties
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