Demonstration of polarization control GaN-based micro-cavity lasers using a rigid high-contrast grating reflector
説明
<jats:title>Abstract</jats:title><jats:p>We reported on GaN microcavity (MC) lasers combined with one rigid TiO<jats:sub>2</jats:sub> high-contrast grating (HCG) structure as the output mirror. The HCG structure was directly fabricated on the GaN structure without an airgap. The entire MC structure comprised a bottom dielectric distributed Bragg reflector; a GaN cavity; and a top HCG reflector, which was designed to yield high reflectance for transverse magnetic (TM)- or transverse electric (TE)-polarized light. The MC device revealed an operation threshold of approximately 0.79 MW/cm<jats:sup>2</jats:sup> when pulsed optical pumping was conducted using the HCG structure at room temperature. The laser emission was TM polarized with a degree of polarization of 99.2% and had a small divergence angle of 14° (full width at half maximum). This laser operation demonstration for the GaN-based MC structure employing an HCG exhibited the advantages of HCGs in semiconductor lasers at wavelengths from green to ultraviolet.</jats:p>
収録刊行物
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- Scientific Reports
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Scientific Reports 9 (1), 13055-, 2019-09-10
Springer Science and Business Media LLC