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Nonlinear optical absorption in a graphene infrared photodetector

Gowda, Prarthana and Mohapatra, Dipti R and Misra, Abha (2014) Nonlinear optical absorption in a graphene infrared photodetector. In: NANOTECHNOLOGY, 25 (33).

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Official URL: http://dx.doi.org/10.1088/0957-4484/25/33/335710


The photoresponse of the graphene photodetector elucidated strong dependence on several optical parameters, such as the angle of incidence and the incident power of infrared exposure at room temperature. The sinusoidal dependence of the photoresponse on incidence angle, which had not been realized before, has now been revealed. The combined effect of the photo excited charge carrier and the photon drag effect explain this nonlinear optical absorption in graphene at lower incident power. The nonlinear dependence of the charge carrier generation on the incident power revealed that this process contributed to the nonlinear photoresponse. However, a deviation is observed at a higher incident power due to the induction of thermal effects in the graphene lattice. This work demonstrates the tunability of the graphene photodetector under a systematic variation that involves both parameters.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 Aug 2014 05:08
Last Modified: 27 Aug 2014 05:08
URI: http://eprints.iisc.ac.in/id/eprint/49688

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