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Multiple p-n junction subwavelength gratings for transmission-mode electro-optic modulators

Title
Multiple p-n junction subwavelength gratings for transmission-mode electro-optic modulators
Author
송석호
Keywords
WAVE-GUIDE STRUCTURES; SILICON; FILTERS; DESIGN
Issue Date
2017-04
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 7, Article no. 46508
Abstract
We propose a free-space electro-optic transmission modulator based on multiple p-n-junction semiconductor subwavelength gratings. The proposed device operates with a high-Q guided-mode resonance undergoing electro-optic resonance shift due to direct electrical control. Using rigorous electrical and optical modeling methods, we theoretically demonstrate a modulation depth of 84%, on-state efficiency 85%, and on-off extinction ratio of 19 dB at 1,550 nm wavelength under electrical control signals within a favorably low bias voltage range from -4 V to +1 V. This functionality operates in the transmission mode and sustainable in the high-speed operation regime up to a 10-GHz-scale modulation bandwidth in principle. The theoretical performance prediction is remarkably advantageous over plasmonic tunable metasurfaces in the power-efficiency and absolute modulation-depth aspects. Therefore, further experimental study is of great interest for creating practical-level metasurface components in various application areas.
URI
https://www.nature.com/articles/srep46508https://repository.hanyang.ac.kr/handle/20.500.11754/113654
ISSN
2045-2322
DOI
10.1038/srep46508
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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