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Ultra-broadband spatial light modulation with dual-resonance coupled epsilon-near-zero materials

Nano Research 2021年第8期14卷 2673-2680页

作者： Qin Chen Shichao Song Huacun Wang Li Liang Yajin Dong Long Wen Institute of Nanophotonics Jinan UniversityGuangzhou 511443China Institute of Photonics Technology Jinan UniversityGuangzhou 511443China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China

It has been found that the dielectric constants of transparent conductive oxides(TCOs)can be adjusted in an extremely large range by tuning the carrier *** to the remarkable light confinement property of the epsilon-near-zero(ENZ)effect of TCOs,it has attracted extensive interests of light ***,the operation wavelength bandwidth is usually limited by optical resonance that is applied to enhance the light-TCOs *** this work,a dual-resonance light coupling scheme is proposed to expand the modulation depth-bandwidth product with almost one order-of-magnitude *** a metallic subwavelength grating structure with deep trenches backed by a ground plane,the ENZ mode can be coupled to both magnetic resonance and Fabry-Perot resonance respectively by tuning the *** light modulation can be obtained in a large operation wavelength band covering two resonances by optimizing the dual-resonance *** a reconfigurable efficient broadband modulation is important for robust communication link and possesses remarkable capacity for wavelength division multiplexing.

关键词： epsilon-near-zero spatial light modulation plasmonics transparent conductive oxides field effect

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Modified textured surface MOCVD-ZnO:B transparent conductive layers for thinfilm solar cells

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Journal of Semiconductors 2014年第4期35卷 37-41页

作者：陈新亮闫聪博耿新华张德坤魏长春赵颖张晓丹 Institute of Photo-Electronic Thin Film Devices and Technology Nankai University Tianjin Key Laboratory of Photo-Electronic Thin Film Devices and Technology Nankai University Key Laboratory of Opto-Electronic Information Science and Technology for Ministry of Education NankaiUniversity

Modified textured surface boron-doped ZnO （ZnO：B） transparent conductive layers for thin-film solar cells were fabricated by low-pressure metal organic chemical vapor deposition （LP-MOCVD） on glass substrates. These modified textured surface ZnO：B thin films included two layers. The first ZnO：B layer, which has a pyramid- shaped texture, was deposited under conventional growth conditions, and the second layer, which has a sphere- like structure, at a relatively lower growth temperature. Typical bi-layer ZnO：B thin films exhibit a high electron mobility of 27.6 cm^2/（V.s） due to improved grain boundary states. For bi-layer ZnO：B, the haze value increases and the total transmittance decreases with the increasing film thickness of the second modification layer. When applied in hydrogenated microcrystalline silicon （μc-Si：H） thin-film solar cells, the modified textured surface ZnO：B layers present relatively higher conversion efficiency than conventional ZnO：B films.

关键词： zinc oxide thin films transparent conductive oxides MOCVD textured surface thin-film solar cells

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Structural and optical properties of Zn-doped β-Ga_2O_3 films

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Journal of Semiconductors 2012年第7期33卷 20-23页

作者：岳伟闫金良吴江燕张丽英 School of Physics Ludong University

Intrinsic fi-Ga203 and Zn-doped β-Ga203 films were prepared using RF magnetron sputtering. The effects of the Zn doping and thermal annealing on the structural and optical properties are investigated. In compar- ison with the intrinsic β-Ga203 films, the microstructure, optical transmittance, optical absorption, optical energy gap, and photoluminescence ofZn-doped β-Ga203 films change significantly. The post-annealed β-Ga203 films are polycrystalline. After Zn doping, the crystallization deteriorates, the optical band gap shrinks, the transmittance decreases and the UV, blue, and green emission bands are enhanced.

关键词： transparent conductive oxides Zn-doped β-Ga203 optical transmittance optical band gap photolu-minescence

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Tunable and reconfigurable metasurfaces and metadevices

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Opto-Electronic Advances 2018年第5期1卷 7-31页

作者： Arash Nemati Qian Wang Minghui Hong Jinghua Teng Institute of Materials Research & Engineering Agency for Science Technology and Research (A＊STAR) 2 Fusionopolis Way Singa-pore 138634 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

Metasurfaces, two-dimensional equivalents of metamaterials, are engineered surfaces consisting of deep subwavelength features that have full control of the electromagnetic waves. Metasurfaces are not only being applied to the current de-vices throughout the electromagnetic spectrum from microwave to optics but also inspiring many new thrilling applica-tions such as programmable on-demand optics and photonics in future. In order to overcome the limits imposed by pas-sive metasurfaces, extensive researches have been put on utilizing different materials and mechanisms to design active metasurfaces. In this paper, we review the recent progress in tunable and reconfigurable metasurfaces and metadevicesthrough the different active materials deployed together with the different control mechanisms including electrical, ther-mal, optical, mechanical, and magnetic, and provide the perspective for their future development for applications.

关键词： tunable reconfigurable metasurface metamaterial transparent conductive oxides ferroelectrics graphene phase change material semiconductor micro-nanoelectromechanical systems

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