Simulation of Modes in Terahertz Quantum-Cascade Microring and Microdisk Lasers

V. Tamošiūnas a, b, Z. Kancleris a, c and M. Tamošiūnienė a a Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania b Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223 Vilnius, Lithuania c Faculty of Physics, Vilnius University, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania

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Received: 26 08 2007;

In our contribution, we report on finite-difference time-domain simulations of modes in microring and microdisk terahertz quantum-cascade lasers with external radii of 100 μm and less. Our simulations have revealed a possibility of low radiative loss for lowest and second order whispering gallery modes in such devices, even when the effective mode volume is reduced below the cubic wavelength.

DOI: 10.12693/APhysPolA.113.917 PACS numbers: 42.50.Pq, 42.55.Sa, 42.60.Da