The recent emergence of low dimensional quantum materials provides an excellent platform to investigate various elementary excitations for next generation devices. In some materials, the Coulombic attraction between 2D electrons and holes binds to form hydrogen-like quasiparticles known as excitons. The large binding energy together with the unprecedented light-matter interactions provides a unique platform for future classical and quantum devices serving various applications spanning from communication to sensing. In this talk, I will discuss our results on manipulating exciton dynamics including energy transport in 2D material system of transition metal dichalcogenides that leverage the complex band system, mechanical flexibility as well as dielectric screening. In particular, I will discuss the interaction of the 2D excitons with surface acoustic waves as a viable platform for hybrid quantum optoexcitonic devices.
Excitons are quasi-particles found in semiconductors that are bound together by the coulombic interaction between an excited electron and a hole. They play an essential role in the working of commercial optoelectronic devices such as displays, solid state lighting and solar cells as well as natural processes such as photosynthesis. In this talk, I will discuss our group’s effort towards understanding and controlling the excitonic energy dynamics at hybrid interfaces formed between organic semiconductors and transition metal dichalcogenides (TMDs) monolayers. I will also showcase the implementation of such hybrid interfaces in assured electronics as well as in nanoelectronics. Such van der Waals interfaces present an opportunity to develop a new class of hybrid semiconductors with superior electronic, optical, magnetic and chemical properties that can be exploited for next-generation applications in photovoltaics, light generation, and data processing.
We propose a waveguide integrated plasmonic platform in order to deliver excitation power to and collect signal
efficiently from a nanoantenna. The system consists of a silicon waveguide with an integrated nanoantenna and a fiber
spot size converter. The nanoantenna is designed to have a broad resonance around 1.5 microns with an estimated
surface enhanced Raman scattering (SERS) enhancement of 6 orders of magnitude and collection efficiency up to 80%.
The device is fabricated on a silicon-on-insulator (SOI) wafer. The proposed and fabricated device can be used in
applications such as on-chip SERS spectroscopy, infrared spectroscopy and gas sensing.
Suspended silicon based nanostructures for optomechanic applications have been successfully fabricated using the
Hydrofluoric acid (HF) vapor phase etching technique. In this paper, we demonstrate the fabrication of parallel silicon
waveguides with a cross section of 250nm x 220nm, and photonic crystal nanobeam cavities with an air gap as small as
50nm between these released structures. The waveguides have been suspended over a distance of more than 75um.
Stiction is a major issue for releasing structures with gaps in the order of tens of nanometers. At the same time, the
process has to be gentle due to the small dimensions of the structures involved in the release process. HF vapor etching
technique was successfully utilized to etch the 2um thick thermally grown sacrificial silicon oxide layer. This process
has an high yield as no liquid is in contact with the structures being released, thus eliminating any kind of liquid flow
which typically proves to be a potential destruction source for such small structures. This HF vapor phase etching is a
simple and controllable process which completely eliminates the requirement of any kind of sophisticated drying
techniques needed with conventional wet etching.
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