High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells

Yidong Hou; Meng Qiu; Zhaolong CaoJie ZhouHock Chun OngWei JinJinglei DuDangyuan Lei

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High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells

机译：High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells

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Plasmonic chiral nanostructures have attracted a great deal of attention inchirality-based biosensing, enantioselective separation, and recently photonicorbital angular momentum-based quantum information processing. However,the intrinsic Ohmic losses of metals and significant radiative scatteringof plasmonically resonant nanostructures result in small quality factors andhence weak optical chirality (such as circular dichroism, CD). Here, it isreported that propagating surface plasmon polaritons (SPPs)—an achiralelectromagnetic surface wave—can significantly enhance the Q-factors oflocalized surface plasmon resonance (LSPR) related CD in plasmonic latticeswith chiral unit cells. It is demonstrated experimentally and theoretically thatmode interaction between the highly dispersive achiral SPPs and the nondispersivechiral LSPR results in the formation of hybrid chiral SPPs, enablingefficient tuning of the resultant transmission CD dispersion and signal intensity.A maximum CD signal of 0.8 is experimentally observed with a Q-factorof 45 in the visible spectral region, showing good agreement with theoreticalcalculations. This study provides an effective yet facile approach for engineeringboth the strength and dispersion of optical chirality, paving the wayfor realizing large-scale, low-cost, and high-performing chiral plasmonic anddielectric metasurfaces for a variety of sensing, imaging, and informationmanipulation.

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《Advanced functional materials》 |2022年第40期|2204095.1-2204095.9|共9页
作者
Yidong Hou; Meng Qiu; Zhaolong CaoJie ZhouHock Chun OngWei JinJinglei DuDangyuan Lei;
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作者单位

School of Physical Science and TechnologySichuan UniversityChengdu 610064, P. R. China Department of Applied PhysicsThe Hong Kong Polytechnic UniversityHung Hom, Hong Kong 999077, P. R. China;

Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHung Hom, Hong Kong 999077, P. R. China;

Department of PhysicsThe Chinese University of Hong KongHong Kong 999077, P. R. ChinaSchool of Physical Science and TechnologySichuan UniversityChengdu 610064, P. R. ChinaDepartment of Applied PhysicsThe Hong Kong Polytechnic UniversityHung Hom, Hong Kong 999077, P. R. China Department of Materials Science and EngineeringCity University of Hong Kong83 Tat Chee Avenue, Hong Kong 999077, P. R. China;

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chiral metasurfaces; circular dichroism; glancing angle deposition; gold nanohole arrays; surface plasmon polariton;

High-Q Circular Dichroism Resonances in Plasmonic Lattices with Chiral Unit Cells

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