By Ki Young Kim
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Extra resources for Advances in Optical and Photonic Devices
H. Guo, Q. Lu and J. F. Donegan School of Physics, Trinity College Dublin Ireland 1. Introduction Widely tunable semiconductor lasers will play a critical part in future technologies. Tunable lasers are rapidly replacing fixed wavelength lasers in dense wavelength division multiplexing DWDM optical communications. The performance specifications of tunable lasers are the same as fixed wavelength specifications plus additional specifications that include: wavelength tuning range; wavelength switching speed; and minimum wavelength spacing.
2006). The photonic quantum ring (PQR) laser is an attractive candidate for high-density “laser” displays, given the unique operating characteristics attendant on its quantum-wire-like nature, such as extremely low threshold currents and thermally stable spectra in the typical operatingtemperature range. 7As, emitting at 850nm. Moreover, we have observed unusual convex WCMs from reverse-mesa (=hole)-type micro-resonators, whose WCMs we interpreted with respect to gain-guiding and photonic quantum corral effects.
The above lasers were however two dimensional (2D) WGM which is troubled with the well-known WGM light spread problem. For the remedy of this problem, asymmetric WGM lasers of stadium type (Nockel & Stone, 1997) were then introduced to control the spreading light beam. (Wiersig & Hentschel, 2008) On the other hand, when we employ a new micro-cavity of vertically reflecting distributed Bragg reflector (DBR) structures added below and above quantum well (QW) planes, say a few active 80Å (Al) GaAs QWs, a 3D toroidal cavity is formed giving rise to helix standing waves in 3D whispering cave modes (WCMs) as shown Fig.