Abstract

Colloidal semiconductor quantum dots (QDs), with a size tunable bandgap and remarkably high quantum efficiency, have been recognized as ideal light sources in quantum information and light emitting devices. For light sources, besides the emission intensity and spectral profile, the degree of polarization (DoP) is an essential parameter. Here, by embedding a monolayer of QDs inside the nanogap between a bottom Au mirror and a top Ag nanowire, we have demonstrated highly polarized light emission from the QDs with an average DoP of 0.89. In addition to the anisotropic photoluminescence (PL) intensity, the PL spectra are distinct at different polarizations, with an asymmetric spectral shape or even two-peak features. Such an anisotropic emission behavior arises from the coupling between the QDs and the largely confined and polarization-dependent gap-plasmons in the Au/QD/Ag nanocavities in the intermediate coupling regime. Our results demonstrate the possibility of achieving highly polarized light sources by coupling spherical QDs to single anisotropic plasmonic nanocavities, to provide new opportunities in the future design of polarized QD-based display devices.

© 2023 Optica Publishing Group

Microcavity coupled quantum dot emission with detuning control

Zhen Yang, Penghua Ma, Guilin Bai, Baoquan Sun, Wei Du, and Tao Wang
Opt. Lett. 47(8) 2089-2092 (2022)

Strong light emission from a defective hexagonal boron nitride monolayer coupled to near-touching random plasmonic nanounits

Zeinab Eftekhari, Amir Ghobadi, Mahmut Can Soydan, Deniz Umut Yildirim, Neval Cinel, and Ekmel Ozbay
Opt. Lett. 46(7) 1664-1667 (2021)

Quantum-dot light-chip micro-spectrometer

Zhiqin Yin, Qingquan Liu, Xueyu Guan, Maobing Xie, Wei Lu, and Shaowei Wang
Opt. Lett. 48(13) 3371-3374 (2023)

Coupling of spontaneous emission from GaN–AlN quantum dots into silver surface plasmons

Arup Neogi, Hadis Morkoç, Takamasa Kuroda, and Atsushi Tackeuchi
Opt. Lett. 30(1) 93-95 (2005)

Site-controlled InAs quantum dot chains coupled to surface plasmons

Teemu Hakkarainen, Juha Tommila, Andreas Schramm, Janne Simonen, Tapio Niemi, Christian Strelow, Tobias Kipp, Juha Kontio, and Mircea Guina
Optica 3(2) 139-142 (2016)