High-Efficiency Directional Radiation via Slow Light Resonance of Modified Photonic Crystal Array

Guoyan Dong,1,*Email

Shuhui Zheng,1

Huanhuan Wang,1

Qian Zhao2,*Email

Ji Zhou3,*Email

1 Center of Materials Science and Optoelectronics Engineering, School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China.

2 State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China.

3 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

* E-mail: gydong@ucas.ac.cn, zhaoqian@tsinghua.edu.cn, zhouji@tsinghua.edu.cn

 

Abstract

Directional light manipulation plays an important role in the optical link and communication of nanotechnology and modern optics. In this work, we provide a practical solution for directional radiation based on drastic slow light resonance near the photonic band-edge. Unidirectional stretched oscillations in the modified resonator almost completely suppress both longitudinal reflected and leaky losses to guarantee transverse scatterings with high directivity. The scaling invariance and flexible tunability of photonic crystal enable it to operate with relaxed structural parameters from infrared to microwaves. Microwave experiments have demonstrated the energy transfer and directional radiation process, agreeing well with the theoretical results. The iconic advantages of high transfer efficiency > 90%, far better directivity gain, 3db splitting, and flexible tunability make photonic crystal (PhC)-resonators promising for advanced application in the wireless link, filtering, and sensing of micro-nano integrated circuits.

High-Efficiency Directional Radiation via Slow Light Resonance of Modified Photonic Crystal Array