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.
|Title of host publication||Physics and Simulation of Optoelectronic Devices XXVI|
|Editors||Marek Osinski, Yasuhiko Arakawa, Bernd Witzigmann|
|Publication status||Published - 2018|
|Event||Physics and Simulation of Optoelectronic Devices XXVI 2018 - San Francisco, United States|
Duration: 2018 Jan 29 → 2018 Feb 1
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Other||Physics and Simulation of Optoelectronic Devices XXVI 2018|
|Period||18/1/29 → 18/2/1|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grants (NRF-2012R1A4A1029061, 2015R1A2A1A10052826, NRF-2014R1A1A3049671); Yonsei University Future-Leading Research Initiative (2015– 22–0147).
© 2018 SPIE.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering