Nonclassical Light from Semiconductor Lasers and LEDs

Charles Santori

Gagik Yu. Kryuchkyan, Karen V. Kheruntsyan

Y. Yamamoto

The generation and application of nonclassical light (number-phase squeezed states and single-photon states) from semiconductor lasers and mesoscopic LEDs are discussed. The shot noise suppression in the three-partition processes such as the electron transport in a highly dissipative conductor, the electron injection and tunneling in a pn junction, and the radiative recombination of an electron-hole pair inside a cavity is the basic principle for this generation scheme.

Hiroyuki Sumitomo, Yutaka Kadoya, M. Yamanishi +1 more

Summary form only given. Among a variety of schemes for nonclassical light generation, the generation of sub-Poissonian photon-states with semiconductor lasers or light-emitting-diodes (LEDs) has been attracting much attention, primarily from engineering point of view. In this talk, we shall present our experimental results, manifesting substantial noise suppression of output photon fluxes below standard quantum limit (SQL) level from a single LED surprisingly without recourse to high-impedance circuit at room temperature. The observed squeezing is interpreted semiquantitatively in terms of our new model including effects of microscopic backward pump process.

Masahide Kobayashi, Hiroyuki Sumitomo, Masamichi Yamanishi +1 more

M. V. Lebedev, A.L. Parakhonsky, A. A. Demenev

Strong correlations in the fluctuations of the intensity of emission from a semiconductor microcavity under resonant laser excitation are observed. The intensity correlation function exhibits an unusual oscillatory behavior with an unexpectedly long oscillation period and decay time. The visibility of the correlation function reaches 0.81. Long oscillation times are attributed to the Rabi frequency characterizing weak coupling between the electromagnetic field of the semiconductor microcavity mode and long-lived exciton states localized by the random potential of the quantum well. For a laser excitation power density of 400 W/cm 2 , the power density of the radiation emitted by the microcavity is 12 W/cm 2 , which corresponds to the total flux of nonclassical light of 1.5 × 10 15 photons/s from an excited spot 50 μm in diameter. Thus, a microcavity can serve as a bright emitter of nonclassical light.