Leveraging Nanocavity Harmonics for Control of Optical Processes in 2D Semiconductors.
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.
†Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, United States.|‡Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, United States.
Gleb M
GM
Akselrod
∥Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Tian
T
Ming
†Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, United States.|‡Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, United States.|⊥Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.
Christos
C
Argyropoulos
†Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, United States.|§Department of Physics, Duke University, Durham, North Carolina 27708, United States.
Thang B
TB
Hoang
∥Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Yuxuan
Y
Lin
∥Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Xi
X
Ling
†Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, United States.|‡Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, United States.|§Department of Physics, Duke University, Durham, North Carolina 27708, United States.
David R
DR
Smith
∥Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Jing
J
Kong
†Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, United States.|‡Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, United States.|§Department of Physics, Duke University, Durham, North Carolina 27708, United States.
Maiken H
MH
Mikkelsen
2D semiconductors; MoS2; Plasmonics; nanocavity; nanocube; photoluminescence enhancement