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Ideality in a fiber-taper-coupled microresonator system for application to cavity quantum electrodynamics
S M Spillane1, T J Kippenberg, O J Painter
1Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.
Physical Review Letters
|August 9, 2003
Summary
Achieve over 99.97% ideality in fiber-taper coupling to silica microspheres for quantum optics. A new technique measures this high coupling efficiency and diagnoses parasitic losses in waveguide junctions.
Area of Science:
- Quantum Optics
- Nanophotonics
- Materials Science
Background:
- Near-lossless coupling between waveguides and resonators is crucial for quantum-optical studies and applications.
- Ideality quantifies the loss at the waveguide-resonator junction.
Purpose of the Study:
- To demonstrate high-ideality coupling exceeding 99.97% using fiber-tapered waveguides and high-Q silica microspheres.
- To introduce a novel technique for measuring ideality and diagnosing parasitic coupling.
Main Methods:
- Fiber-taper coupling to high-Q silica microspheres.
- Development of a measurement technique to assess ideality across various coupling strengths.
- Diagnostic analysis of parasitic coupling within the fiber-taper-waveguide junction.
Main Results:
- Achieved coupling ideality greater than 99.97% under optimized conditions.
- The introduced technique successfully measures ideality and identifies parasitic coupling.
- Validated the feasibility of near-lossless coupling for advanced optical applications.
Conclusions:
- High-ideality coupling is attainable with fiber-tapered waveguides and silica microspheres.
- The developed measurement technique is effective for characterizing coupling performance.
- This advancement supports the development of efficient quantum-optical devices.