Mid Term Review

Control of light emission from 2D materials by resonant nanostructures

Date & time

Tue 13 Dec 2016, 11am–12pm

Location

Room:

Oliphant Seminar Room

Audience

Members of RSPE welcome

Contact

(02)61253063
Mr Haitao Chen
PhD student, Nonlinear Physics Center

Monolayers of transition-metal dichalcogenides (TMDs) exhibit unique optoelectronic properties, such as direct bandgap, robust valley polarization and strong electric tunability. In particular, they are promising to be used as light source because they show both strong photoluminescence and second-harmonic emission. On the other hand, the subnanometer thickness (light-matter interaction length) of such active materials limits their overall emission conversion efficiency and prevents practical application. Resonant nanostructures such as plasmonic nanoantenna, subwavelength Si grating could effectively control and boost light-matter interaction at nanoscale. Here we demonstrate how to manipulate the photoluminescence of monolayer MoSe2 by coupling it with resonant plasmonic nanoantenna. We also show how to integrate such materials with waveguide structures to boost the second-harmonic generation from the monolayer MoSe2 through pumping the material by guided modes. Besides, we demonstrate enhanced and directional emission from monolayer WSe2 by double-resonant, dielectric subwavelength Si grating structure. Future proposals of controlling the valley polarization of monolayer WSe2 will also be discussed.

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