WGM Microresonator with Plasmonic Nanoparticles and Quantum Dots
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Solution Overview
Problem
Current WGM microresonators face challenges in enhancing the intensity of resonance modes while narrowing the resonance peak width, which limits the Q-factor, a measure of resonator efficiency.
Innovation Solution
Incorporating plasmonic nanoparticles with diameters of 10 to 50 nm and luminescent semiconductor or perovskite quantum dots with diameters from 1 to 15 nm into a dielectric matrix, specifically low-melting inorganic glasses, to achieve internal amplification and resonance peak narrowing, thereby increasing the Q-factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional WGM microresonators are used, then the device structure is simple, but the resonance mode intensity is low and the resonance peak width is broad, resulting in low Q-factor
Solution Approach 1:
The patent applies composite materials by combining plasmonic nanoparticles (silver, gold, or copper) with luminescent quantum dots (CdSe, CdTe, or perovskite) within a dielectric glass matrix. This composite structure enables simultaneous electromagnetic field amplification through plasmonic effects and resonance peak narrowing through quantum dot luminescence, achieving high Q-factor values exceeding 10^6 while maintaining a relatively simple spherical microresonator geometry.
2Reliability
If the resonance peak width is narrowed to increase Q-factor, then the resonator efficiency improves, but the intensity of resonance modes decreases
Solution Approach 1:
The patent merges two distinct mechanisms: plasmonic nanoparticles that amplify electromagnetic fields through localized surface plasmon resonance, and quantum dots that provide narrow luminescence peaks. The plasmonic component increases resonance mode intensity by enhancing the electromagnetic field, while the quantum dot component narrows the resonance peak width through its inherent narrow emission spectrum. This merging of functions allows simultaneous improvement of both resonance intensity and Q-factor.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combination of plasmonic nanoparticles and quantum dots results in enhanced electromagnetic field amplification and reduced resonance peak width, significantly increasing the Q-factor and enabling active microresonators with improved performance.
Implementation Method 1
at least one type of plasmonic nanoparticles (silver) with negative real part of the electric permittivity Re(ε)
Implementation Method 2
at least one type of luminescent semiconductor or perovskite quantum dots
Implementation Method 3
As a result of total internal reflection, the wave propagates at the surface of the resonator
Data Source
Figure 1~2
AI summary
The object of the invention is a WGM microresonator, applicable particularly in sensing to the detection of physical or biological properties or as filters in optical fibre lines. A WGM microresonator according to the invention is characterized in that in the dielectric matrix with positive real part of the electric permittivity Re(e)>0 in the UV/VIS/NIR wavelength range of electromagnetic radiation it comprises at least one type of plasmonic nanoparticles with negative real part of the electric permittivity Re(e)<0 in the UV/VIS/NIR wavelength range of electromagnetic radiation and/or at least one type of luminescent semiconductor or perovskite quantum dots.