Optical properties of subwavelength wiregrid polarizer designed for GaN-based LED

Guiju Zhang; Bing Cao; Qin Han; Chinhua Wang; Baoshun Zhang; Ke Xu

doi:10.1117/12.843329

20 October 2009 Optical properties of subwavelength wiregrid polarizer designed for GaN-based LED

Guiju Zhang, Bing Cao, Qin Han, Chinhua Wang, Baoshun Zhang, Ke Xu

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74932Q (2009) https://doi.org/10.1117/12.843329
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

A theoretical simulation is presented on the optical transmission and polarized extinction ratio through subwavelength wiregrid polarizer for GaN-based LED. The micro-polarizers are specially designed based on rigorous coupled wave analysis method for operation wavelengths of blue light (470nm) and green light (520nm) with metal wiregrid on the GaN substrate. The TM transmittance and the extinction ratio of TM and TE transmittances are influenced by period, thickness and duty cycle of the metal wiregrid. Aluminum and silver metal film grating under subwavelength is separately used for optimization design to improve the optical properties at the visible wavelengths. Simulation results show that, as the thickness of the metal grating decreases, the coupled light shifts the TM transmittance peak to shorter wavelength. As the same time, the extinction ratio remains a high value. TM transmittance coefficients separately greater than 95% and 97% with extinction ratio greater than 33dB are achieved for GaN-based aluminum grating and silver grating at the wavelength 470nm. And TM coefficients are greater than 92% and 96% with extinction ratios greater than 33dB, respectively at the wavelength 520nm. The thicknesses and periods of the metal grating are with sizes about 300nm, which are under subwavelength structures. The numerical results are useful for designing and fabricating novel photonic nanostructure polarized optical devices.

Citation Download Citation

Guiju Zhang, Bing Cao, Qin Han, Chinhua Wang, Baoshun Zhang, and Ke Xu "Optical properties of subwavelength wiregrid polarizer designed for GaN-based LED", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74932Q (20 October 2009); https://doi.org/10.1117/12.843329

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KEYWORDS

Aluminum

Silver

Metals

Polarizers

Light emitting diodes

Optical design

Transmittance

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