185. plasmon enhanced nonlinear optical nano device and materials

Department: NanoEngineering
Faculty Advisor(s): Andrea R. Tao

Primary Student
Name: Yuan Zeng
Email: yuz481@ucsd.edu
Phone: 858-822-0241
Grad Year: 2021

Abstract
Nonlinear optics is a technique which converts low energy photons to high energy photons, can be applied to nanolaser, bioimaging, clinical diagnostics, waveguide etc. From the definition of 2nd order nonlinear optics, the efficiency is quadratic dependent on excitation intensity, due to the unique properties of plasmonic (increase absorption and field confinement), near field intensity can be enhanced orders of magnitude and dramatically increase nonlinear optical emission. 2nd order nonlinear optics includes Second harmonic generation (SHG) and two-photon photo-luminance (TPPL). In SHG project, we use chemically synthesized Ag nanocubes (AgNCs) and Langmuir-Blodgett (LB) film method to fabricate meta-surface with double resonance, at both excitation wavelength and emission wavelength. The experiment result shows our meta-surface efficiency is compatible with recent nanostructures made by lithography, and this meta-surface still have potential to further increase efficiency by orders of magnitude. The advantages of our SHG metasurface includes cost effective, wafer scale fabrication and board band tunable resonance. In TPPL project, we are aiming for new semiconductor nanomaterials with higher TPPL cross-section and less toxicity. In 2016, our group already made Se-doped CuS nanodisks with 7211.5GM TPPL cross-section, on the same order of solid state luminescent materials such as CdSe quantum dots and gold nanorods. Currently, we are working on optimization of LSRP properties and electronic properties of semiconductor nanoparticles, by using cation doping, anion doping, and brand new transition metal oxide (TMO).

Industry Application Area(s)
Electronics/Photonics | Materials | Semiconductor

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