Graphene planar lightwave circuit sensors for chemical detection

Ashok Maliakal; Saima Husaini; Leslie Reith; Paul Bollond; Steve Cabot; Paul Sheehan; Sandra Hangartar; Scott Walton; Cy Tamanaha

doi:10.1117/12.2252644

20 February 2017 Graphene planar lightwave circuit sensors for chemical detection

Ashok Maliakal, Saima Husaini, Leslie Reith, Paul Bollond, Steve Cabot, Paul Sheehan, Sandra Hangartar, Scott Walton, Cy Tamanaha

Author Affiliations +

Proceedings Volume 10107, Smart Photonic and Optoelectronic Integrated Circuits XIX; 101070T (2017) https://doi.org/10.1117/12.2252644
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Sensing devices based on Graphene Field Effect Transistors (G-FET) have been demonstrated by several groups to show excellent sensitivity for a variety of chemical agents. These devices are based on measuring changes in the electrical conductivity of graphene when exposed to various chemicals. However, because of its unique band structure, graphene also exhibits changes in its optical response upon chemical exposure. The conical intersection of the valence and conduction bands results in a low density of states near the Dirac point. At this point, chemical doping resulting from molecular binding to graphene can result in dramatic changes in graphene’s optical absorption. Here we will discuss our recent work in developing a graphene planar lightwave circuit (PLC) sensor which exploits these optical and electronic properties of graphene to demonstrate chemical sensitivity. The devices are based on a strong evanescent coupling of graphene via electrically gated silicon nanowire waveguides. A strong response in the form of a reversible optical attenuation change of 6 dB is shown when these devices interact with toxic industrial chemicals such as iodine and ammonia. The optical transition can also be tuned to the optical c-band (1530-1565 nm) which enables these devices to operate at telecom wavelengths.

Citation Download Citation

Ashok Maliakal, Saima Husaini, Leslie Reith, Paul Bollond, Steve Cabot, Paul Sheehan, Sandra Hangartar, Scott Walton, and Cy Tamanaha "Graphene planar lightwave circuit sensors for chemical detection", Proc. SPIE 10107, Smart Photonic and Optoelectronic Integrated Circuits XIX, 101070T (20 February 2017); https://doi.org/10.1117/12.2252644

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available