Abstract

In this paper, a new design for a lens built around a two-dimensional (2D) metallic photonic crystal (PhC) platform with negative refractive index is proposed. The proposed lens has been composed of a silver layer with a triangular array of circular air holes. A three-dimensional geometric study performed with the aid of 2D finite element method results in focusing the light rays with intensity and FWHM of 10.5 and 1.7 μm, respectively. The suggested lens is used to efficiently couple the light from a planar waveguide with a large spot size area into another PhC waveguide with a subwavelength spot size area. Additionally, filling the drilled holes in the proposed lens with nematic liquid crystal allows obtaining a reconfigurable lens with significant wave FWHM shaping with extinction ratios of about 8 dB. The proposed reconfigurable lens is used to couple two different waveguides with different coupling ratios.

© 2018 Optical Society of America

Photonic crystal lens for coupling two waveguides

Margarita I. Kotlyar, Yanis R. Triandaphilov, Alexey A. Kovalev, Victor A. Soifer, Maria V. Kotlyar, and Liam O'Faolain
Appl. Opt. 48(19) 3722-3730 (2009)

Coupling silica waveguides to photonic crystal waveguides through a multilayered Luneburg lens

S. Hadi Badri and M. M. Gilarlue
J. Opt. Soc. Am. B 37(1) 104-109 (2020)

Efficient terahertz coupling lens based on planar photonic crystals on silicon on insulator

Chunchen Lin, Caihua Chen, Ahmed Sharkawy, Garrett J. Schneider, Sriram Venkataraman, and Dennis W. Prather
Opt. Lett. 30(11) 1330-1332 (2005)

Electrically tunable lens based on a dual-frequency nematic liquid crystal

Oleg Pishnyak, Susumu Sato, and Oleg D. Lavrentovich
Appl. Opt. 45(19) 4576-4582 (2006)

Ultra-short polarization beam splitter based on rhombic structure dual-core photonic crystal fiber with a central hole filled nematic liquid crystal

Yanan Xu, Jinhui Yuan, Yuwei Qu, Shi Qiu, Xian Zhou, Binbin Yan, Kuiru Wang, Xinzhu Sang, and Chongxiu Yu
J. Opt. Soc. Am. B 40(1) 206-214 (2023)