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Proceedings Paper

Numerical analysis of blazed wire-grid polarizer for plasmonic enhancement
Author(s): Changhun Lee; Eunji Sim; Donghyun Kim
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Paper Abstract

We analyze the characteristics of plasmonics-based enhancement of a wire-grid polarizer (WGP) by rigorous coupledwave analysis (RCWA). We consider blazed WGP (bWGP) for improvement of polarimetric performance based on plasmonic momentum-matching in the metal/dielectric interface. The analysis used a model of triangular wire-grids approximated with five graded layers of identical thickness. We have compared the performance to that of a conventional WGP (cWGP) with a corresponding lamellar grating shape profile. As a performance measure, we calculated transmittance (TR) and extinction ratio (ER). It was found that TR in both cases tends to decrease monotonically with a longer period (Λ). The maximum TR of bWGPs is lower than cWGPs. On the other hand, maximum ER of bWGPs is much higher than that of cWGPs, particularly at a longer period, with an extinction peak peaked at Λ = 800 nm. For cWGPs, an extinction peak is observed at Λ = 200 nm with comparable enhancement (~42 dB). We have also computed relative TR (RTR) and relative ER (RER) for assessment of performance relative to cWGP. RTR decreases slowly in a manner similar to TR, however, RER increases exponentially with a longer wire-grid period. The results suggest that strong localization of near-fields observed with bWGPs can be used to improve polarimetric performance of a WGP.

Paper Details

Date Published: 23 February 2018
PDF: 6 pages
Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 105262H (23 February 2018); doi: 10.1117/12.2291123
Show Author Affiliations
Changhun Lee, Yonsei Univ. (Korea, Republic of)
Eunji Sim, Yonsei Univ. (Korea, Republic of)
Donghyun Kim, Yonsei Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 10526:
Physics and Simulation of Optoelectronic Devices XXVI
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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