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Low-switching energy resonant-tunneling photodetectors

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5 Author(s)
Moise, T.S. ; Corp. Res. & Dev., Texas Instrum. Inc., Dallas, TX, USA ; Goldsmith, C.L. ; Kao, Y.-C. ; Schow, C.
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We report the optoelectronic characteristics of an optically-switched resonant-tunneling diode (ORTD) consisting of a 40 nm n/sup +/ InGaAs cap layer, a 250 nm n/sup +/ InAlAs emitter window, and an AlAs/InGaAs/AlAs DB heterostructure. Under the DB, we have positioned a thick undoped InGaAs absorber layer which serves both to absorb the incident photons and to increase the peak-to-valley voltage swing. In operation with photons of 0.9 eV or higher, the photogenerated electron-hole pairs within this absorber layer screen the applied electric field leading to a reduction in both peak and valley voltage. When biased with a resistor load, this photo-induced voltage shift is used to switch the device from a high-conductance to a low-conductance operating state. Tn contrast to previous demonstrations, we have integrated the ORTD within a microwave package to enable high-speed (Gb/s) optically-induced switching.

Published in:

Device Research Conference Digest, 1997. 5th

Date of Conference:

23-25 June 1997