Title :
Monolithic Subwavelength High-Index-Contrast Grating VCSEL
Author :
Gebski, Marcin ; Dems, Maciej ; Wasiak, Michal ; Lott, James A. ; Czyszanowski, Tomasz
Author_Institution :
Photonics Group, Lodz Univ. of Technol., Lodz, Poland
Abstract :
In this letter, we propose and numerically investigate a new vertical-cavity surface-emitting laser (VCSEL) structure consisting of a nearly lambda-thick active optical cavity sandwiched between two planar monolithic subwavelength high-index-contrast gratings (MHCGs) etched directly into the semiconductor layers surrounding the optical cavity. The structure allows the reduction of the vertical thickness of the subsequent MHCG VCSEL to roughly 0.6 μm for emission at 980 nm. Compared with a conventional all-semiconductor VCSEL with distributed Bragg reflector mirrors, the MHCG VCSEL has a shorter effective cavity length and thus a shorter roundtrip cavity time. Our proposed design enables the fabrication of VCSELs with lattice-matched mirror layers in all common semiconductor optoelectronic material systems, or alternatively VCSELs with hybrid HCGs.
Keywords :
diffraction gratings; etching; laser cavity resonators; laser mirrors; optical fabrication; quantum well lasers; surface emitting lasers; cavity length; etching; lattice-matched mirror layers; monolithic subwavelength high-index-contrast grating VCSEL; nearly lambda-thick active optical cavity; planar monolithic subwavelength high-index-contrast gratings; roundtrip cavity time; semiconductor layers; semiconductor optoelectronic material systems; vertical thickness; vertical-cavity surface-emitting laser structure; wavelength 980 nm; Cavity resonators; Gratings; Optical reflection; Optical refraction; Optical variables control; Vertical cavity surface emitting lasers; Numerical simulations; high contrast gratings; vertical-cavity surface-emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2447932
