Leveraging Nanocavity Harmonics for Control of Optical Processes in 2D Semiconductors

Authors

Gleb M. Akselrod, Duke University
Tian Ming, Massachusetts Institute of Technology
Christos Argyropoulos, University of Nebraska-LincolnFollow
Thang B. Hoang, Duke University
Yuxuan Lin, Massachusetts Institute of Technology
Xi Ling, Massachusetts Institute of Technology
David R. Smith, Duke University
Jing Kong, Massachusetts Institute of Technology
Maiken H. Mikkelsen, Duke UniversityFollow

Document Type

Article

Date of this Version

2015

Citation

Nano Lett. 2015, 15, 3578−3584

Comments

© 2015 American Chemical Society

Open access

DOI: 10.1021/acs.nanolett.5b01062

Abstract

Optical cavities with multiple tunable resonances have the potential to provide unique electromagnetic environments at two or more distinct wavelengthscritical for control of optical processes such as nonlinear generation, entangled photon generation, or photoluminescence (PL) enhancement. Here, we show a plasmonic nanocavity based on a nanopatch antenna design that has two tunable resonant modes in the visible spectrum separated by 350 nm and with line widths of ∼60 nm. The importance of utilizing two resonances simultaneously is demonstrated by integrating monolayer MoS2, a two-dimensional semiconductor, into the colloidally synthesized nanocavities. We observe a 2000-fold enhancement in the PL intensity of MoS2 -which has intrinsically low absorption and small quantum yield-at room temperature, enabled by the combination of tailored absorption enhancement at the first harmonic and PL quantum-yield enhancement at the fundamental resonance.