Special Section on Quantum Dots

Quantum dot nanophotonics - from waveguiding to integration

[+] Author Affiliations
Lih Y. Lin, Chia-Jean Wang, Michael C. Hegg

Department of Electrical Engineering, University of Washington, Box 352500, Seattle, WA 98195

Ludan Huang

Department of Physics, University of Washington, Seattle, WA 98195

J. Nanophoton. 3(1), 031603 (January 23, 2009). doi:10.1117/1.3046754
History: Received September 11, 2008; Revised November 12, 2008; Accepted November 13, 2008; January 23, 2009; Online January 23, 2009
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Abstract

Due to its unique optoelectronic properties, the quantum dot (QD) has become a promising material for realizing photonic components and devices with high quantum efficiencies. Quantum dots in colloidal form can have their surfaces modified with various molecules, which enables new fabrication process utilizing molecular self-assembly and can result in new QD photonic device structures in nano-scale. In this review paper, we describe QD waveguides for sub-diffraction-limit waveguiding, nano-scale QD photodetectors for sensing with high spatial resolution and sensitivity, as well as integration of these two nanophotonic components. The paper will provide an overview on the operating principles, fabrications and characterizations of the devices. The QD waveguide achieved a transmission loss of 3 dB/4 micron, which is lower than the experimental results from other sub-diffraction limit waveguides that have been reported. It also demonstrated a comparable waveguiding effect through a waveguide with a sharp bend. The QD photodetector showed a sensitivity of 60 pW over a device with a nano-gap of 25 nm for detection. The compatibility between the fabrication processes for these two components with colloidal QDs allows integration of them through self-assembly fabrications.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Lih Y. Lin ; Chia-Jean Wang ; Michael C. Hegg and Ludan Huang
"Quantum dot nanophotonics - from waveguiding to integration", J. Nanophoton. 3(1), 031603 (January 23, 2009). ; http://dx.doi.org/10.1117/1.3046754


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