Enhancement of terahertz radiation from GaP emitters by subwavelength antireflective micropyramid structures.
Subwavelength antireflective micropyramid structures, designed by rigorous coupled-wave analysis and fabricated by precision micromachining, are used to enhance the terahertz (THz) radiation output of optical rectification in GaP crystal-based emitters. An average 16% increase in the THz radiation power emitted by a 3 mm GaP crystal is experimentally demonstrated using an antireflective micropyramid grating with a period of 60 μm and a base angle of 55.5°. Optimized pyramidal-frustum gratings are shown to operate as highly efficient antireflective structures within an ultrabroadband range of 0.5-5 THz.
Ultrafast Laser Laboratory, College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin, China.
Xiaokun
X
Hu
Yanfeng
Y
Li
Fengzhou
F
Fang
Xian
X
Li
Jiang
J
Li
Yunhui
Y
Chen
Xiaodong
X
Zhang
Lu
L
Chai
Chingyue
C
Wang
Andrey B
AB
Fedotov
Aleksei M
AM
Zheltikov