Very-low-threshold photonic band-edge lasers from free-standing triangular photonic crystal slabs

Ryu, Han-Youl; Kwon, Soon-Hong; Lee, Yong-Jae; Lee, Yong-Hee; Kim, Jeong-Soo
May 2002
Applied Physics Letters;5/13/2002, Vol. 80 Issue 19, p3476
Academic Journal
Photonic band-edge lasers are realized in the free-standing triangular photonic crystal slab with InGaAsP quantum wells at 80 K. Surface-emitting lasing actions are observed from the samples whose wavelengths correspond to the second or the third photonic band edge near the Γ point of the band structure, which is confirmed by the three-dimensional finite-different time-domain calculation. A very low threshold of 35 μW (incident pump power) is achieved from the laser operating near the third transverse-electric-mode band edge. This low threshold is benefited from low optical losses near the Γ point as well as reduced surface recombination carrier losses and enhanced material gain at low temperature. It is interesting to note that this two-dimensional distributed feedback lasing action is observed from a surprisingly small pump area of 6 μm in diameter. © 2002 American Institute of Physics.


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