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Broadband performance limits of ultra-thin lenses using time-domain analysis
Author(s) -
Jeremy Teichman
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.435206
Subject(s) - strehl ratio , optics , wavefront , broadband , coherence (philosophical gambling strategy) , diffraction , physics , time domain , computer science , quantum mechanics , computer vision
Thin lenses of sufficient diameter and focusing power cannot fully compensate for variation in free-space time of flight to maintain and focus an intact wavefront and instead combine successive wavefronts. The limited temporal coherence of broadband light reduces the effectiveness of such interference. Using effective medium theory and scalar diffraction we exploit time-domain analysis to show that the temporal coherence of illumination imposes hard limits on the performance of thin lenses as measured by the Strehl ratio. These limits apply equally to diffractive optical elements and metalenses.

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