Graphene-contact electrically driven microdisk lasers

Yoon-Ho Kim, Soon-Hong Kwon, Jung Min Lee, Min-Soo Hwang, Ju-Hyung Kang, Won Il Park () and Hong-Gyu Park ()
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Yoon-Ho Kim: Korea University
Soon-Hong Kwon: Chung-Ang University
Jung Min Lee: Hanyang University
Min-Soo Hwang: Korea University
Ju-Hyung Kang: Korea University
Won Il Park: Hanyang University
Hong-Gyu Park: Korea University

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract Active nanophotonic devices are attractive due to their low-power consumption, ultrafast modulation speed and high-density integration. Although electrical operation is required for practical implementation of these devices, it is not straightforward to introduce a proper current path into such a wavelength-scale nanostructure without affecting the optical properties. For example, to demonstrate electrically driven nanolasers, complicated fabrication techniques have been used thus far. Here we report an electrically driven microdisk laser using a transparent graphene electrode. Current is injected efficiently through the graphene sheet covering the top surface of the microdisk cavity, and, for the first time, lasing operation was achieved with a low-threshold current of ~300 μA at room temperature. In addition, we measured significant electroluminescence from a graphene-contact subwavelength-scale single nanopillar structure. This work represents a new paradigm for the practical applications of integrated photonic systems, by conformally mounting graphene on the complex surfaces of non-planar three-dimensional nanostructures.

Date: 2012
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DOI: 10.1038/ncomms2137

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