Abstract

We provide an improved surface-mode photonic crystal (PhC) $T$-junction waveguide, combine it with an improved PhC bandgap $T$-junction waveguide, and then provide an ultracompact $1\times 4$ TM-polarized beam splitter. The energy is split equally into the four output waveguides. The maximal transmission ratio of each output waveguide branch equals 24.7%, and the corresponding total transmission ratio of the ultracompact $1\times 4$ beam splitter equals 98.8%. The normalized frequency of maximal transmission ratio is 0.397($2\pi c/a$), and the bandwidth of the ultracompact $1\times 4$ TM-polarized beam splitter is 0.0106($2\pi c/a$). To the best of our knowledge, this is the first time such a high-efficiency $1\times 4$ beam splitter exploiting the nonradiative surface mode as a guided mode has been proposed. Although we only employed a $1\times 4$ beam splitter, our design can easily be extended to other $1\times n$ beam splitters.

©2012 Optical Society of America

Design of surface mode photonic crystal T-junction waveguide using coupled-mode theory

Bin Jiang, Wenjun Zhou, Wei Chen, Anjin Liu, and Wanhua Zheng
J. Opt. Soc. Am. B 28(8) 2038-2041 (2011)

Ultracompact photonic crystal polarization beam splitter based on multimode interference

Ming-Feng Lu, Shan-Mei Liao, and Yang-Tung Huang
Appl. Opt. 49(4) 724-731 (2010)

Highly efficient photonic-crystal splitters based on one-way waveguiding

Zhuoyuan Wang, Linfang Shen, Zaihe Yu, Xianmin Zhang, and Xiaodong Zheng
J. Opt. Soc. Am. B 30(1) 173-176 (2013)

Ultracompact high-efficiency polarizing beam splitter with a hybrid photonic crystal and conventional waveguide structure

Seunghyun Kim, Gregory P. Nordin, Jingbo Cai, and Jianhua Jiang
Opt. Lett. 28(23) 2384-2386 (2003)

Low-loss, efficient, wide-angle 1  ×  4 power splitter at ∼1.55  μm wavelengths for four play applications built with a monolithic photonic crystal slab

Jian Zhou, Huiping Tian, Daquan Yang, Qi Liu, Lijun Huang, and Yuefeng Ji
Appl. Opt. 53(34) 8012-8019 (2014)