Abstract
We investigate the photocurrent generation by two-photon absorption effect in silicon microdisk resonators integrated with diodes. The photocurrent is quite dependent on the junction position with respect to the whispering gallery mode. Avalanche gain increases significantly when the bias exceeds , leading to considerable enhancement of photocurrent. At bias with on-chip optical power of 44.7 μW, the responsivity exceeds 1 A/W with an avalanche gain of 188 while the dark current is more than 50 times lower than the photocurrent.
© 2014 Optical Society of America
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