@article { ISI:000273085900007,
	title = {Deformed microcavity quantum cascade lasers with directional emission},
	journal = {NEW JOURNAL OF PHYSICS},
	volume = {11},
	year = {2009},
	month = {DEC 17},
	publisher = {IOP PUBLISHING LTD},
	type = {Article},
	address = {TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND},
	abstract = {We report the experimental realization of deformed microcavity quantum cascade lasers (QCLs) with a Lima on-shaped chaotic resonator. Directional light emission with a beam divergence of theta(parallel to) approximate to 33 degrees from QCLs emitting at lambda approximate to 10 mu m was obtained in the plane of the cavity for deformations in the range 0.37 \&lt; epsilon \&lt; 0.43. An excellent agreement between measured and calculated far-field profiles was found. Both simulations and experiments show that the Lima on-shaped microcavity preserves whispering gallery-like modes with high Q-factors for low deformations (epsilon \&lt; 0.50). In addition, while the measured spectra show a transition from whispering gallery-like modes to a more complex mode structure at higher pumping currents, we observed {\textquoteleft}universal far-field behavior{\textquoteright} for different intracavity mode distributions in the Lima on},
	issn = {1367-2630},
	doi = {10.1088/1367-2630/11/12/125018},
	author = {Wang, Qijie and Yan, Changling and Diehl, Laurent and Hentschel, Martina and Wiersig, Jan and Nanfang Yu and Pfluegl, Christian and Belkin, Mikhail A. and Edamura, Tadataka and Yamanishi, Masamichi and Kan, Hirofumi and Federico Capasso}
}
