1. Supermode Hybridization: A Material-Independent Route toward Record Schottky Detection Sensitivity Using <0.05 μm3 Amorphous Absorber Volume
- Author
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Amr S. Helmy, Charles Lin, and Po-Han Chang
- Subjects
Materials science ,business.industry ,Mechanical Engineering ,Photonic integrated circuit ,Photodetector ,Schottky diode ,Bioengineering ,Physics - Applied Physics ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Amorphous solid ,Responsivity ,Optoelectronics ,General Materials Science ,Photonics ,0210 nano-technology ,business ,Absorption (electromagnetic radiation) ,Physics - Optics ,Common emitter - Abstract
Schottky photodetectors are attractive for CMOS-compatible photonic integrated circuits, but the trade-off between photon absorption and hot carrier emission often compromises the detection fidelity and sensitivity. Here, we report a hybridization-based waveguiding effect that can improve the sensitivity of guided-wave Schottky detection by >200x. By hybridizing the supermodes guided by asymmetrical coupled plasmonic nanostructures, light-matter-interaction can be significantly enhanced even if the thickness of the light absorbing region is only a few nanometers, thus allowing the absorption and emission efficiencies to be simultaneously optimized for the first time. Using amorphous-based active junction with absorbing volume of only 0.031 {\mu}m3, our detectors demonstrate record experimental sensitivity of -55 dBm, approaching that of crystalline-based Ge counterparts with >36x larger absorption region. The ability to maximize field overlap within small device volume and improve photodetection fidelity without using crystalline materials pave the way towards improved back-end-of-line interconnection, single photon detection, and 2D optoelectronics., Comment: 26 pages, 5 figures more...
- Published
- 2020
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