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(a) Schematic of the GaN-based VCSEL. (b) Band diagram of the asymmetric coupled QWs. (c) Band gap variation and distribution of optical standing waves in the VCSEL active region.
Normalized PL spectra of the asymmetric coupled QWs and conventional uniform QWs at room temperature. Inset: schematic potential profile for the asymmetric coupled QWs with consideration of the polarization effect.
(a) The variation of emission spectrum with increase of the pumping energy. (b) Emission intensity as a function of the pumping energy at room temperature.
Emission intensity vs pumping energy in a logarithmic scale. Solid symbols are experimental data, and the line is the theoretical fitting curve.
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