11 September 2006 Near-field compact dielectric optics
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Aplanatic optics crafted from transparent dielectrics can approach the etendue limit for radiative transfer in pragmatic near-field systems. Illustrations are presented for the more demanding realm of high numerical aperture (NA) at the source and/or target. These light couplers can alleviate difficulties in aligning system components, and can achieve the fundamental compactness limit for optical devices that satisfy Fermat's principle.
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Daniel Feuermann, Daniel Feuermann, Jeffrey M. Gordon, Jeffrey M. Gordon, Tuck Wah Ng, Tuck Wah Ng, } "Near-field compact dielectric optics", Proc. SPIE 6338, Nonimaging Optics and Efficient Illumination Systems III, 633809 (11 September 2006); doi: 10.1117/12.679006; https://doi.org/10.1117/12.679006

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