Optical lattices of InGaN quantum well excitons.

Authors :: Chaldyshev, V. V.
Bolshakov, A. S.
Zavarin, E. E.
Sakharov, A. V.
Lundin, W. V.
Tsatsulnikov, A. F.
Yagovkina, M. A.
Kim, Taek
Park, Youngsoo
Source :: Applied Physics Letters; 12/19/2011, Vol. 99 Issue 25, p251103, 4p, 5 Graphs
Publication Year :: 2011
Abstract: We demonstrate optical Bragg lattices formed by quasi-two-dimensional excitons in periodic systems of the InGaN quantum wells separated by the GaN barriers. When the Bragg resonance and exciton-polariton resonance are tuned to each-other, the medium exhibits an exciton-mediated resonantly enhanced optical Bragg reflection. The enhancement factor appeared to be larger than 2 for the system of 60 quantum wells. Owing to a high binding energy and oscillator strength of the excitons in InGaN quantum wells, the resonant enhancement was achieved at room temperature. [ABSTRACT FROM AUTHOR]