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Wavelength selective detection using excitonic resonances in multiquantum-well structures

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3 Author(s)
Goswami, S. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Bhattacharya, Pallab ; Singh, J.

The wavelength and voltage dependence of photocurrent near excitonic resonances are used to study the wavelength selectivity of p-i(multiple quantum well, or MQW)-n photodiode structures with a parallel sequence of optical bits, each with a different wavelength. The selectivity is considered good if the state of a λi wavelength bit can be detected regardless of λj(j i) state of the bits. Photocurrent is found to have very good selectivity only if λj bits are all zero, i.e., the optical information is serial, but it is also found that differential photocurrent (ΔIphV ) provides a good selectivity for random states of λj bits (i.e., parallel input). Four channel selectivity is demonstrated at 200 K. Specifically designed quantum-well structures can greatly improve this selectivity

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Quantum Electronics, IEEE Journal of  (Volume:27 ,  Issue: 4 )