ABSTRACT
The emission spectra of photonic-quantum-ring lasers can be explained by a three-dimensional Rayleigh-Fabry-Perot cavity resonance model. The proposed model for the emission spectral peaks fits well with the observed blueshift of the emission spectrum envelope as a function of the view angle. Furthermore, we observe that the emission spectra with the high-order mode index showed blueshift behaviors as functions of the injection current, whereas those with the low-order mode index showed redshift behaviors. These phenomena might result in lowering the effective refractive index by the carrier inhomogeneity in the active disk.
ABSTRACT
The spectrum of a three-dimensional Rayleigh-Fabry-Perot microdisk cavity of a photonic quantum-ring laser is analyzed for angle-dependent emission modes. It is shown that joint consideration of the Fabry-Perot resonance condition and the whispering-gallery mode boundary condition explains the emitting angles and spectral distribution of the cavity modes well.
ABSTRACT
We have observed the emission spectra of three-dimensional Rayleigh-Fabry-Perot cavity whispering-gallery modes from photonic quantum ring lasers that give rise to uniform angular mode spacing in space. The observed angular distribution (0 degrees approximately 30 degrees) of the emission modes is linear with respect to the mode number. For example, the average angular mode spacing is 0.95 degrees with a standard deviation of 0.098 degrees for a 20-microm-diameter laser, whose potential angle-resolving power is promising for angle-sensing applications in the future.
