Tunable absorption characteristics in multilayered structures with graphene for biosensing

Electrically tunable coherent optical absorption in graphene with ion gel.

We demonstrate electrical control over coherent optical absorption in a graphene-based Salisbury screen consisting of a single layer of graphene placed in close proximity to a gold back reflector. The screen was designed to enhance light absorption at a target wavelength of 3.2 μm by using a 600 nm-thick, nonabsorbing silica spacer layer. An ionic gel layer placed on top of the screen was used ...

Nanostructuring Platinum Nanoparticles on Multilayered Graphene Petal Nanosheets for Electrochemical Biosensing

Graphene in biosensing

JULY-AUGUST 2011 | VOLUME 14 | NUMBER 7-8 308 Graphene is a one-atom-thick material consisting of sp2-bonded carbon with a honeycomb structure. It resembles a large polyaromatic molecule of semi-infinite size1, 2. In the past five years, graphene-based nanomaterials have been the focus of a vast amount of attention. The interesting and exciting properties of single-layer graphene sheets, such a...

Tunable large resonant absorption in a midinfrared graphene Salisbury screen

Min Seok Jang ( ),1,2,* Victor W. Brar ( ),2,3,* Michelle C. Sherrott,2 Josue J. Lopez,2 Laura Kim ( ),2 Seyoon Kim ( ),2 Mansoo Choi ( ),1,4 and Harry A. Atwater2,3,† 1Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 151-744, Republic of Korea 2Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, U...

Gate-tunable coherent perfect absorption of terahertz radiation in graphene

Perfect absorption of radiation in a graphene sheet may play a pivotal role in the realization of technologically relevant optoelectronic devices. In particular, perfect absorption of radiation in the terahertz (THz) spectral range would tremendously boost the utility of graphene in this difficult range of photon energies, which still lacks cheap and robust devices operating at room temperature...