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Timestamp: 2019-04-25 16:57:55+00:00

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Laser operation of a GaN vertical cavity surface emitting laser (VCSEL) is demonstrated under optical pumping with a nanoporous distributed Bragg reflector (DBR). High reflectivity, approaching 100%, is obtained due to the high index-contrast of the nanoporous DBR. The VCSEL system exhibits low threshold power density due to the formation of high Q-factor cavity, which shows the potential of nanoporous medium for optical devices.
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Fig. 1 (a) Schematic diagram of the GaN VCSEL structure with nanoporous DBRs. Cross-sectional SEM images of nanoporous DBRs etched in 70% HNO3 at (b) 15 V, (c) 17 V, and (d) 19 V are displayed.
Fig. 2 Measured (solid line) and simulated (dashed line) reflectivity spectra of the GaN VCSEL with nanoporous DBRs, etched at (a) 15 V, (b) 17 V, and (c) 19 V. The blue lines represent μ-PL spectra from the corresponding VCSEL cavities.
Fig. 3 Laser output intensity as a function of the pump power. The VCSELs were etched at (a) 15 V, (b) 17 V, and (c) 19 V. The insets show the laser emission spectra and associated linewidths.
Fig. 4 Laser emission intensity as a function of the pump power, plotted on a logarithmic scale, fitted by the semiconductor rate equation for nanoporous VCSELs etched at (a) 15 V, (b) 17 V, and (c) 19 V.
Fig. 5 Polarization characteristics of nanoporous VCSEL (black dot). The data were fitted by a sine function (red line). The inset was added to display the preferential polarization direction in connection with the nanopore propagation direction.

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