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Updated: Jan 6, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Unidirectional Giant Exciton Emission into a Photonic Waveguide.
Qifa Wang1, Huan Luo1, Chaojie Ma2
1Northwestern Polytechnical University, Key Laboratory of light-field manipulation and information acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Xi'an 710129, China.
Researchers achieved a 3500-fold photoluminescence enhancement and unidirectional emission from 2D Indium Selenide (InSe) using plasmonic nanocavities. This breakthrough enables efficient integration of nanoscale light sources for on-chip nanophotonics.
Area of Science:
- Nanophotonics and Integrated Optics
- Materials Science
- Quantum Technologies
Background:
- Efficient coupling of nanoscale light sources into photonic waveguides is essential for advanced applications.
- Existing challenges include the fundamental incompatibility between strong light confinement and directional emission.
- Need for bright, unidirectional light sources for integrated photonics, quantum technologies, and biosensing.
Purpose of the Study:
- To demonstrate simultaneous giant excitonic photoluminescence (PL) enhancement and unidirectional emission from 2D Indium Selenide (InSe).
- To overcome the incompatibility between light confinement and directional radiation using plasmonic nanocavities.
- To achieve efficient coupling of nanoscale light sources into photonic waveguides for on-chip applications.
Main Methods:
- Integration of a two-dimensional InSe film with an asymmetric plasmonic nanocavity.
- Engineering of spatial, spectral, and orientational overlap between nanocavity modes and InSe excitons.
- Utilizing symmetry breaking within the nanocavity to control emission interference and directivity.
Main Results:
- Achieved a 3500-fold enhancement in excitonic photoluminescence (PL).
- Demonstrated record-high directivity exceeding 15 dB due to controlled emission interference.
- Obtained a high coupling efficiency of 24% and supported guided light propagation over 140 μm.
Conclusions:
- The developed approach enables scalable integration of nanoscale light sources into monolithic photonic circuits.
- This work establishes a viable method for creating ultracompact, highly efficient on-chip nanophotonic devices.
- Advances the development of integrated photonics, quantum technologies, and biosensing platforms.
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