Strong coupling and induced transparency at room temperature with single quantum dots and gap plasmons

被引:218
作者
Leng, Haixu [1 ]
Szychowski, Brian [2 ]
Daniel, Marie-Christine [2 ]
Pelton, Matthew [1 ]
机构
[1] UMBC, Dept Phys, Baltimore, MD 21250 USA
[2] UMBC, Dept Chem & Biochem, Baltimore, MD 21250 USA
基金
美国国家科学基金会;
关键词
SPONTANEOUS EMISSION; MULTIEXCITON STATES; PHOTON-EMISSION; PHOTOLUMINESCENCE; EXCITONS; NANOCRYSTALS; SPECTROSCOPY; NANOCAVITIES; MICROCAVITY; SPECTRA;
D O I
10.1038/s41467-018-06450-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Coherent coupling between plasmons and transition dipole moments in emitters can lead to two distinct spectral effects: vacuum Rabi splitting at strong coupling strengths, and induced transparency (also known as Fano interference) at intermediate coupling strengths. Achieving either strong or intermediate coupling between a single emitter and a localized plasmon resonance has the potential to enable single-photon nonlinearities and other extreme light-matter interactions, at room temperature and on the nanometer scale. Both effects produce two peaks in the spectrum of scattering from the plasmon resonance, and can thus be confused if scattering measurements alone are performed. Here we report measurements of scattering and photoluminescence from individual coupled plasmon-emitter systems that consist of a single colloidal quantum dot in the gap between a gold nanoparticle and a silver film. The measurements unambiguously demonstrate weak coupling (the Purcell effect), intermediate coupling (Fano interference), and strong coupling (Rabi splitting) at room temperature.
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页数:7
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