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Japanese Journal of Applied Physics

Generation of Extremely Weak Sub-Poissonian Light Using High-Efficiency Light-Emitting Diodes

Masanobu Nakano, Kenichi Tanaka, A. Higashi, 竜二 増山, Yutaka Kadoya, Masamichi Yamanishi

Published Jul 30, 2004• 0 citations
Publisher

Abstract

The squeezing of the intensity noise in the extremely weak light emanating from a light-emitting diode (LED) was investigated. By the use of a tailor-made high-efficiency LED, in which the active region is heavily doped (∼3.5×1019 cm-3), we successfully observed sub-Poissonian light at an injection current and photocurrent as low as 1 µA and 160 nA, respectively, at room temperature. The experimental results also implied that the theoretical model describing the noise behavior needs to be refined, particularly in the case of extremely low injection levels where the nonradiative recombination process has a serious effect.

DOI
10.1143/jjap.43.l1114

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The squeezing of the intensity noise in the extremely weak light emanating from a light-emitting diode (LED) was investigated. By the use of a tailor-made high-efficiency LED, in which the active region is heavily doped (∼3.5×1019 cm-3), we successfully observed sub-Poissonian light at an injection current and photocurrent as low as 1 µA and 160 nA, respectively, at room temperature. The experimental results also implied that the theoretical model describing the noise behavior needs to be refined, particularly in the case of extremely low injection levels where the nonradiative recombination process has a serious effect.
We investigated the generation of sub-Poissonian light in light-emitting diodes (LEDs) in which the active region is heavily doped with Be. The squeezing of the intensity-fluctuation below the full-shot-noise level was observed in a wide frequency range, near-dc to 1.5 GHz. From the noise-suppression spectra, we evaluated the radiative recombination lifetime of electrons in the active region and confirmed that the lifetime is reduced with increasing doping density. The results demonstrate clearly the excellent noise properties as well as the capability of high-speed modulation of the LEDs.
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We have investigated the squeezing of intensity-fluctuation below the full-shot-noise level in light-emitting diodes (LEDs) at low-photon flux levels. By using a tailor-made LED, the squeezing over a wide frequency range, near-dc to 1.5 GHz was achieved at an injection-current level as low as 100 μA. As a result, the number of photons, which can be expected in the sub-Poissonian light, was reduced to the order of 105 per pulse, nearly three orders of magnitude smaller than those obtained in commercial LEDs.
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