Journal
OPTICS EXPRESS
Volume 26, Issue 6, Pages 7368-7375Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.007368
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Funding
- National Natural Science Foundation of China [61490712, 61427819, U1701661]
- National Key Basic Research Program of China (973) [2015CB352004]
- Leading Talents of Guangdong Province Program [00201505]
- Natural Science Foundation of Guangdong Province [2016A030312010]
- Science and Technology Innovation Commission of Shenzhen [KQTD2015071016560101, ZDSYS201703031605029]
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We suggest a plasmonic nanodevice for performing the second-order spatial derivative of light fields. The device consists of five gold nanorods arranged to evanescently couple to each other so that emit cross-polarized output proportional to the second-order differentiation of the incident wave. A theoretical model based on the electrostatic eigenmode analysis is derived and numerical simulations using the finite-difference time-domain methods are provided as supporting evidence. It is shown in both the analytic and numerical methods that the proposed plasmonic circuit performs second-order differentiation of the phase of the incident light field in transmission mode with a subwavelength planar resolution. The resolution of 0.29 lambda(-1) is numerically demonstrated for a 20 nm thick circuit at the wavelength of 700 nm. The suggested plasmonic device has potential application in miniaturized systems for all-optical computation. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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