Near-IR Subwavelength Microdisk Lasers

Details Near-IR Subwavelength Microdisk Lasers Near-IR Subwavelength Microdisk Lasers

2008-10-15

arxiv.org/abs/0810.2748v1

Physics

Optics

12pages 4figures

Scientific paper

10.1063/1.3081106

We report single-mode lasing in subwavelength GaAs disks under optical pumping. The disks are fabricated by standard photolithography and two steps of wet chemical etching. The simple fabrication method can produce submicron disks with good circularity, smooth boundary and vertical sidewalls. The smallest lasing disks have a diameter of 627 nm and thickness of 265 nm. The ratio of the disk diameter to the vacuum lasing wavelength is about 0.7. Our numerical simulations confirm that the lasing modes are whispering-gallery modes with the azimuthal number as small as 4 and very small mode volume.

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