Design of high sensitivity detector for underwater communication system

J. S. Cheong; J. S. L. Ong; J. S. Ng; A. B. Krysa; F. Bastiman; J. P. R. David

doi:10.1117/12.2031953

5 November 2013 Design of high sensitivity detector for underwater communication system

J. S. Cheong, J. S. L. Ong, J. S. Ng, A. B. Krysa, F. Bastiman, J. P. R. David

Proceedings Volume 8899, Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X; 88990G (2013) https://doi.org/10.1117/12.2031953
Event: SPIE Security + Defence, 2013, Dresden, Germany

Abstract

Al_0.52In_0.48P is the largest bandgap material in III-V non-nitride semiconductors that is lattice matched to a readily available substrate (GaAs). Having a bandgap narrower than that of GaN enables it to detect wavelengths around 480 nm. Such wavelengths have the best transmittance underwater and may be used as a carrier in underwater communication systems. We present an Al_0.52In_0.48P homo-junction Separate-Absorption-Multiplication-Avalanche-Photodiode (SAMAPD) as a high sensitivity detector for such an application. By increasing the neutral and space-charge region thicknesses, the peak response wavelength can be tuned to longer wavelengths with a narrower full-width-half-maximum (FWHM). The quantum efficiency of the detector reduces with FWHM and this is compensated by having an avalanche gain. At room temperature, the SAM-APD has a dark current of <20 pA for a 210 μm radius device up to 99.9% of breakdown voltage. The structure gives a narrow spectral FWHM of 22 nm with centre wavelength of 482 nm. An external quantum efficiency of 33% and 6410% at 482 nm is obtained at bias voltage of -19 V and -92.6 V respectively.

Citation Download Citation

J. S. Cheong, J. S. L. Ong, J. S. Ng, A. B. Krysa, F. Bastiman, and J. P. R. David "Design of high sensitivity detector for underwater communication system", Proc. SPIE 8899, Emerging Technologies in Security and Defence; and Quantum Security II; and Unmanned Sensor Systems X, 88990G (5 November 2013); https://doi.org/10.1117/12.2031953

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