Low power all optical switching and implementation of universal logic gates using micro-bubbles in semiconductor nanocrystal solutions

Mukherjee, Arpita and Saigal, Nihit and Pandey, Anshu (2020) Low power all optical switching and implementation of universal logic gates using micro-bubbles in semiconductor nanocrystal solutions. In: NANOTECHNOLOGY, 31 (5).

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Abstract

We describe optical switching in solutions of semiconductor nanocrystals illuminated by a 404 nm continuous wave laser source, driven by the formation of a micro-bubble of solvent vapor in the solution. Low boiling solvents such as hexane show an oscillatory modulation of transmitted light intensity (period similar to 4 s) while solvents with intermediate boiling points such as toluene give a stable switching response. An on/off ratio of 83% is observed in the transmitted pump beam. Using this, a pump beam (404 nm, 80 mW continuous wave) was shown to reversibly switch the state of a probe laser (630 nm, 5 mW continuous wave). This switch thus serves as an optical analog of an electronic transistor and demonstrates the potential for all optical switching of low power light beams. Further, all optical universal logic gates, NAND and NOR, were also demonstrated using the micro-bubble switch.

Item Type:	Journal Article
Publication:	NANOTECHNOLOGY
Publisher:	IOP PUBLISHING LTD
Additional Information:	copy right of this article belong to IOP PUBLISHING LTD
Keywords:	micro-bubbles; all optical switching; all optical logic gates; semiconductor nanocrystals
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	06 Dec 2019 05:41
Last Modified:	06 Dec 2019 05:41
URI:	http://eprints.iisc.ac.in/id/eprint/63913

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