Spin-Entangled Photon Emission Device With Integrated Waveguide
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Solution Overview
Problem
Existing spin-entangled photon emission devices face challenges in achieving high efficiency and mechanical stability due to the trade-off between Purcell factor and mechanical instability caused by vibrations in Fabry-Pérot cavities.
Innovation Solution
A spin-entangled photon emission device with a Fabry-Pérot resonator integrated with a solid-state optical waveguide on a substrate, where the diamond membrane forms one mirror, and a controllable pressure exercising layer is used to tune the resonance wavelength, reducing mechanical instability while maintaining a high Purcell factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Fabry-Pérot cavity with high finesse is used to increase the Purcell factor, then the efficiency of coherent photon emission is improved, but mechanical instability due to vibrations increases
Solution Approach 1:
The patent replaces the conventional mechanical Fabry-Pérot cavity with an integrated photonic crystal cavity. This substitution eliminates the mechanical instability issues of traditional cavities while maintaining high Purcell factors through photonic bandgap engineering. The photonic crystal structure confines light through optical rather than mechanical means, achieving high emission efficiency without vibration-induced instability.
Solution Approach 2:
The patent modifies the cavity parameters by using photonic crystal structures with specific lattice constants, hole radii, and layer thicknesses to achieve the desired Purcell factor. By changing the geometric parameters of the photonic crystal rather than relying on mechanical cavity dimensions, the system achieves high emission efficiency while being inherently more stable.
2Reliability
If the cavity finesse is lowered to reduce losses due to instability, then mechanical stability is improved, but the Purcell factor and photon emission efficiency decrease
Solution Approach 1:
The patent replaces the mechanical Fabry-Pérot cavity with an integrated photonic crystal cavity. This substitution eliminates the mechanical instability issues of traditional cavities while maintaining high Purcell factors through photonic bandgap engineering. The photonic crystal structure confines light through optical rather than mechanical means, achieving high emission efficiency without vibration-induced instability.
Solution Approach 2:
The patent uses composite photonic crystal structures combining multiple materials with different refractive indices (e.g., silicon nitride, silica, diamond) to create the cavity. This composite approach enables high Purcell factors through enhanced light-matter interaction while the integrated solid-state structure provides inherent mechanical stability.
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
This configuration enhances entangled photon emission rates by concentrating the electromagnetic field and reducing mechanical instability, allowing for a higher Purcell factor and increased production of entangled states.
Implementation Method 1
placing a diamond membrane with the defect center into a Fabry-Pérot cavity increases the emission rate of the defect center by a factor (known as the Purcell factor), which can be translated into the increase of the efficiency of coherence high photon emission from the defect center
Implementation Method 2
the Fabry-Pérot resonator comprises a solid state optical waveguide integrated on a substrate, the optical waveguide having a first end facet, the first surface of the diamond membrane being bonded to the first end facet
Implementation Method 3
This configuration enhances entangled photon emission rates by concentrating the electromagnetic field and reducing mechanical instability
Implementation Method 4
a Fabry-Pérot resonator, comprising a first and second mirror facing each other; the first mirror being formed by a reflector on the second surface of the diamond membrane and the second mirror being formed by a reflector on a second end facet of the optical waveguide
Data Source
AI summary
The spin-entangled photon emission device comprises a Fabry-Pérot resonator with a solid state optical waveguide integrated on a substrate. Preferably, the device is used in a configuration that makes it possible to tune the resonance wavelength of the Fabry-Pérot resonator by straining or otherwise adjusting the effective optical length of the waveguide. A diamond membrane is located in the Fabry-Pérot resonator. The diamond membrane comprises a photon-source capable of emitting a photon that is entangled with a spin state of the photon source. A first surface of the diamond membrane abuts to a first mirror of the Fabry-Pérot resonator. The optical waveguide has a first end facet bonded to a first surface of the diamond membrane. The first mirror of the Fabry-Pérot resonator is formed by a reflector on the second surface of the diamond membrane. The second mirror of the Fabry-Pérot resonator is formed by a reflector on a second end facet of the optical waveguide or inside the optical waveguide.