Patent ID: 6519271
Filing Date: 2003-02-11
Classification: H01S

Abstract:
A photonic quantum ring (PQR) laser diode with a plurality of laterally extending layers, one on top of another in the stack axis, comprising:an active region sandwiched between an n type multi-layer distributed Bragg reflector (DBR) stack and a p type multi-layer DBR stack and having a rounded circumference, wherein, along the circumference of the active region, three dimensional PQR radiations are emitted with various wavelengths as a function of slanted view angle with respect to the stack axis; a covering region for surrounding the active region and for transmitting the three dimensional PQR radiations therethrough, wherein the refractive index of the active region is larger than that of the covering region so that the three dimensional PQR radiations are confined by a three dimensional toroidal Rayleigh's cavity effectively formed along the circumference of the active region; and striped or segmented top electrodes which make the three dimensional PQR radiations from the three dimensional toroidal Rayleigh's cavity become visible and detectable.