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Chung, Il-Sug
Nano-Optoelectronics Lab.
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Study on differences between high contrast grating reflectors for TM and TE polarizations and their impact on VCSEL designs

Author(s)
Chung, Il-Sug
Issued Date
2015-06
DOI
10.1364/OE.23.016730
URI
https://scholarworks.unist.ac.kr/handle/201301/23714
Fulltext
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-13-16730
Citation
OPTICS EXPRESS, v.23, no.13, pp.16730 - 16739
Abstract
A theoretical study of differences in broadband high-index-contrast grating (HCG) reflectors for TM and TE polarizations is presented, covering various grating parameters and properties of HCGs. It is shown that the HCG reflectors for TM polarization (TM HCG reflectors) have much thicker grating thicknesses and smaller grating periods than the TE HCG reflectors. This difference is found to originate from the different boundary conditions met for the electric field of each polarization. Due to this difference, the TM HCG reflectors have much shorter evanescent extension of HCG modes into low-refractive-index media surrounding the HCG. This enables to achieve a very short effective cavity length for VC-SELs, which is essential for ultrahigh speed VCSELs and MEMS-tunable VCSELs. The obtained understandings on polarization dependences will be able to serve as important design guidelines for various HCG-based devices.
Publisher
OPTICAL SOC AMER
ISSN
1094-4087
Keyword
SUBWAVELENGTHLASER

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