Perfect Optical Absorbers by All-Dielectric Photonic Crystal/Metal Heterostructures Due to Optical Tamm State

Nanomaterials

Ziqian Shang¹  Chao Diao¹  Haiyang Zhou¹  Yunpeng Zhao¹  Kaiyuan Zhang¹  Guang Lu¹  Lei Zhang¹  Xiachen Zhou¹ 

[1] School of Space Science and Physics, Shandong University, Weihai 264209, China;

关键词: optical Tamm state;    perfect absorption;    photonic crystals;    heterostructure;    metal film;    interface;   

DOI  :  10.3390/nano11123447

来源: DOAJ

【 摘 要 】

In this study, we theoretically and experimentally investigated the perfect optical absorptance of a photonic heterostructure composed of a truncated all-dielectric photonic crystal (PC) and a thick metal film in the visible regions. The three simulated structures could achieve narrow-band perfect optical absorption at wavelengths of 500 nm, 600 nm, and 700 nm, respectively. Based on the measured experimental results, the three experimental structures achieved over 90% absorption at wavelengths of 489 nm, 604 nm, and 675 nm, respectively. The experimental results agreed well with the theoretical values. According to electromagnetic field intensity distributions at the absorption wavelengths, the physical mechanism of perfect absorption was derived from the optical Tamm state (OTS). The structure was simple, and the absorption characteristics were not significantly affected by the thickness of the thick metal layer, which creates convenience in the preparation of the structure. In general, the proposed perfect absorbers have exciting prospects in solar energy, optical sensor technology, and other related fields.

【 授权许可】

Unknown