Cavity-induced excitation of Dirac plasmons on graphene for tunable, polarization, and angle-independent enhanced light absorption (Conference Presentation)

Alireza Safaei; Sayan Chandra; Michael N. Leuenberger; Debashis Chanda

doi:10.1117/12.2507637

8 March 2019 Cavity-induced excitation of Dirac plasmons on graphene for tunable, polarization, and angle-independent enhanced light absorption (Conference Presentation)

Alireza Safaei, Sayan Chandra, Michael N. Leuenberger, Debashis Chanda

Author Affiliations +

Proceedings Volume 10920, 2D Photonic Materials and Devices II; 109200G (2019) https://doi.org/10.1117/12.2507637
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

The fast carrier relaxation time, high carrier mobility and electrostatic tunability make graphene a prospective ideal material for electronics and optoelectronics. However, its low optical absorption is a big obstacle. Moreover, for using graphene in the large area optoelectronic devices, any scheme for enhancing the light-matter interaction in graphene should be polarization and incident angle-independent. Here, we demonstrate a novel design of an optical cavity-coupled hexagonal nanohole and nanodisk array to excite Dirac plasmon. We compare the Dirac plasmon lifetimes of the graphene nanohole and nanodisk arrays and their role in the enhanced light-matter interaction. Coupling the patterned graphene to an optical cavity creates a temporal and spatial overlap between the graphene plasmon and cavity modes. This complex geometry gives rise to an unprecedented polarization independent light absorption of 60% on nanohole and 90% on nanodisk arrays in low carrier mobility CVD-grown monolayer graphene in the 8-12 um atmospheric transparent infrared imaging band. Electrostatically doping of the patterned graphene tune the surface plasmon resonance wavelength up to 2.5 um by applying a small gate voltage (4V). We show theoretically, and also for the first time the experimental results of the enhanced light absorption for the non-normal incidence. While the light absorption up to 40° (incident angle) is almost constant, the trend of the angular optical response for s- and p-polarized light are different which is validated by our analytical coupled-dipole approximation modeling. This electronically tunable wide angle extraordinary light absorption paves the path towards new generation of graphene-based optoelectronics devices.

Conference Presentation

Citation Download Citation

Alireza Safaei, Sayan Chandra, Michael N. Leuenberger, and Debashis Chanda "Cavity-induced excitation of Dirac plasmons on graphene for tunable, polarization, and angle-independent enhanced light absorption (Conference Presentation)", Proc. SPIE 10920, 2D Photonic Materials and Devices II, 109200G (8 March 2019); https://doi.org/10.1117/12.2507637

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KEYWORDS

Graphene

Absorption

Plasmons

Polarization

Light-matter interactions

Optoelectronic devices

Electronics

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