Open AccessSmall divergence substrate emitting quantum cascade laser by subwavelength metallic grating
Author(s) -
Di Yao,
Jin-Chuan Zhang,
Yinghui Liu,
Ning Zhuo,
Zhiwei Jia,
Fengqi Liu,
Zhanguo Wang
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.011462
Subject(s) - optics , grating , extraordinary optical transmission , laser , materials science , surface plasmon , cascade , quantum cascade laser , full width at half maximum , optoelectronics , plasmon , substrate (aquarium) , semiconductor laser theory , surface plasmon polariton , physics , chemistry , oceanography , chromatography , geology
Metallic periodic structure in subwavelength scale offers an exciting way to couple light into surface plasmons (SPs), thus manipulating the properties of near-field optics. We show that subwavelength metallic grating (SMG) defined on the substrate side of substrate emitting quantum cascade lasers enables far-field improvement in mid-infrared spectrum. The SMG is designed to tailor the interaction of SPs with single mode transverse magnetic light. The experiment results are in good agreement with the simulated model. A far-field full width at half maximum (FWHM) divergence angle of 3.9 ° in the direction perpendicular to the laser waveguide layers is obtained, improved by a factor of 8.5 compared with traditional surface emitting device.