Quantum dot photonic crystal detectors

Kalyan Teja Posani; Vaibhav Tripathi; Senthil Annamalai; Sanjay Krishna; Raviv Perahia; Orion Crisafulli; Oskar Painter

doi:10.1117/12.641750

7 February 2006 Quantum dot photonic crystal detectors

Kalyan Teja Posani, Vaibhav Tripathi, Senthil Annamalai, Sanjay Krishna, Raviv Perahia, Orion Crisafulli, Oskar Painter

Proceedings Volume 6129, Quantum Dots, Particles, and Nanoclusters III; 612906 (2006) https://doi.org/10.1117/12.641750
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

In this paper we report the use of a photonic crystal resonant cavity to increase the quantum efficiency, detectivity (D*) and the background limited infrared photodetector (BLIP) temperature of a quantum dot detector. The photonic crystal is incorporated in InAs/InGaAs/GaAs dots-in-well (DWELL) detector using Electron beam lithography. From calibrated blackbody measurements, the conversion efficiency of the detector with the photonic crystal (DWELL-PC) is found to be 58.5% at -2.5 V while the control DWELL detectors have quantum efficiency of 7.6% at the same bias. We observed no significant reduction in the dark current of the photonic crystal devices compared to the normal structure. The generation-recombination limited D* at 77K with a 300K F1.7 background, is estimated to be 6 x 10¹⁰ cmHz^1/2/W at -3V bias for the DWELL-PC which is a factor of 20 higher than that of the control sample. We also observed a 20% increase in the BLIP temperature for the DWELL-PCs.

Citation Download Citation

Kalyan Teja Posani, Vaibhav Tripathi, Senthil Annamalai, Sanjay Krishna, Raviv Perahia, Orion Crisafulli, and Oskar Painter "Quantum dot photonic crystal detectors", Proc. SPIE 6129, Quantum Dots, Particles, and Nanoclusters III, 612906 (7 February 2006); https://doi.org/10.1117/12.641750

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