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Chiral plasmonics and enhanced chiral light-matter interactions

Science China(Physics,Mechanics & Astronomy) 2020年第4期63卷 62-72页

作者： Wei Du Xinglin Wen davy gerard Cheng-Wei Qiu Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Light NanomaterialsNanotechnologies(L2n)Institut Charles DelaunayCNRSUniversite de Technologie de TroyesTroyes 10004France Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore MajuLab International Joint Research Unit UMI 3654CNRSUniversite Cote d'AzurSorbonne UniversiteNational University of SingaporeNanyang Technological UniversitySingapore 637371Singapore NOVITAS Nanoelectronics Center of ExcellenceSchool of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore

Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness(left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter(or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically,in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.

关键词： chirality chiral plasmonics chiral light-matter interactions sensing

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Holographically fabricated, highly reflective nanoporous polymeric distributed Bragg reflectors with red, green,and blue colors [Invited]

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Chinese Optics Letters 2020年第8期18卷 34-39页

作者： Haodong Jiang Wenfeng Cai Ke Li Ming Cheng Vineet Kumar Zhen Yin davy gerard Dan Luo Quanquan Mu Yanjun Liu Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Harbin Institute of Technology Harbin 150001China Light NanomaterialsNanotechnologies(L2n)Universitede Technologie de Troyes&CNRS ERL 7004Troyes 10004France State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China

We report holographic fabrication of nanoporous distributed Bragg reflector(DBR) films with periodic nanoscale porosity via a single-prism conuration. The nanoporous DBR films result from the phase separation in a material recipe, which consists of a polymerizable acrylate monomer and nonreactive volatile solvent. By changing the interfering angle of two laser beams, we achieve the nanoporous DBR films with highly reflective red,green, and blue colors. The reflection band of the nanoporous DBR films can be tuned by further filling different liquids into the pores inside the films, resulting in the color change accordingly. Experimental results show that such kinds of nanoporous DBR films could be potentially useful for many applications, such as color filters and refractive index sensors.

关键词： distributed Bragg reflector nanoporous reflection grating holographic fabrication phase separation refractive index sensing

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