Small divergence substrate emitting quantum cascade laser by subwavelength metallic grating | Zendy

Danyang Yao | Zendy; Jin-Chuan Zhang | Zendy; Yinghui Liu | Zendy; Ning Zhuo | Zendy; Zhiwei Jia | Zendy; Fengqi Liu | Zendy; Zhanguo Wang | Zendy

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Small divergence substrate emitting quantum cascade laser by subwavelength metallic grating

Author(s) -

Danyang 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.

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