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.