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Creators/Authors contains: "Choy, Jennifer T."

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  1. ; ; ; ; ; ; ; ; ; (, arXivorg)
    We use crystalline silicon (Si) antennas to efficiently extract broadband single-photon fluorescence from shallow nitrogen-vacancy (NV) centers in diamond into free space. Our design features relatively easy-to-pattern high-index Si resonators on the diamond surface to boost photon extraction by overcoming total internal reflection and Fresnel reflection at the diamond-air interface, and providing modest Purcell enhancement, without etching or otherwise damaging the diamond surface. In simulations, ~20 times more single photons are collected from a single NV center compared to the case without the antenna; in experiments, we observe an enhancement of ~4 times, limited by spatial alignment between the NV and the antenna. Our approach can be readily applied to other color centers in diamond, and more generally to the extraction of light from quantum emitters in wide-bandgap materials. 
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    Free, publicly-accessible full text available September 1, 2025
  2. ; ; ; ; ; ; (, OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES))
    Nitrogen vacancy centers in diamond are used to image electron pathways in corroded zirconium alloys, with preliminary data showing unexpected luminescence from the oxidized zirconium. Our ongoing work includes identifying the origin of this luminescence. 
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    Full Text Available 
  3. ; ; ; ; ; ; ; ; ; ; et al (, Langmuir)
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  4. ; ; ; ; ; ; ; ; ; (, Nanophotonics)
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    Abstract We designed a nanoscale light extractor (NLE) for the efficient outcoupling and beaming of broadband light emitted by shallow, negatively charged nitrogen-vacancy (NV) centers in bulk diamond. The NLE consists of a patterned silicon layer on diamond and requires no etching of the diamond surface. Our design process is based on adjoint optimization using broadband time-domain simulations and yields structures that are inherently robust to positioning and fabrication errors. Our NLE functions like a transmission antenna for the NV center, enhancing the optical power extracted from an NV center positioned 10 nm below the diamond surface by a factor of more than 35, and beaming the light into a ±30° cone in the far field. This approach to light extraction can be readily adapted to other solid-state color centers. 
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