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- Wang, Xiaoyu, et al.
(författare)
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Guest Editorial: Modeling and Simulation Methods for Analysis and Design of Advanced Energy Conversion Systems
- 2020
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Ingår i: IEEE Transactions on Energy Conversion. - 1558-0059 .- 0885-8969. ; 35:1, s. 309-311
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The papers in this special section examine modeling and simulation methods for the analysis and design of advanced energy conversion systems. Energy conversion lies aEnergyveral fronts including materials, conversion methods, power electronics, and controls have created new opportunities for efficient energy conversion from both the conventional and new sources of energy. Our urgent need to solve many critical problems with regards to the sustainability and security of our energy system as well as the ever-increasing environmental challenges facing humanity have further spurred unprecedented opportunities for creation of innovative solutions to address these challenges.
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- Soltanmoradi, Reyhaneh, et al.
(författare)
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Double-resonator structure based on continuous silver thin films for transparent conductors
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A type of metal-dielectric multilayered structures is investigated theoretically and experimentally for achieving relatively wide-band transparency at visible frequencies with high electrical conductivity. The proposed structure comprises of two coupled metal-dielectric-metal planar optical resonators with metal layer thicknesses near to its skin depth. Simulations show that the maximum transmittance for visible light can easily reach 90% for silver-based structures. Experimentally we demonstrate such a sample that exhibits a transmission window with a bandwidth of 150nm and a maximum transmittance of 76% around 643nm wavelength at normal incidence. Its sheet resistance is measured to be less than 10Ω/☐, much smaller than that of common indium-tin-oxide films. Owing to their simple fabrication procedure as well as design flexibility, such a layered structure can serve as a compelling alternative as transparent conductors for optoelectronic devices, especially for liquid-crystal displays and light-emitting diodes.
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| 5. |
- Wang, Jing, 1982-
(författare)
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Fabrication and Characterization of Photonic Crystals, Optical Metamaterials and Plasmonic Devices
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Nanophotonics is an emerging research field that deals with interaction between light and matter in a sub-micron length scale. Nanophotonic devices have found an increasing number of applications in many areas including optical communication, microscopy, sensing, and solar energy harvesting especially during the past two decades. Among all nanophotonic devices, three main areas, namely photonic crystals, optical metamaterials and plasmonic devices, gain dominant interest in the photonic society owning to their potential impacts. This thesis studies the fabrication and characterization of three types of novel devices within the above-mentioned areas. They are respectively photonic-crystal (PhC) surface-mode microcavities, optical metamaterial absorbers, and plasmonic couplers. The devices are fabricated with modern lithography-based techniques in a clean room environment. This thesis particularly describes the critical electron-beam lithography step in detail; the relevant obstacles and corresponding solutions are addressed. Device characterizations mainly rely on two techniques: a vertical fiber coupling system and a home-made optical transmissivity/reflectivity setup. The vertical fiber coupling system is used for characterizing on-chip devices intended for photonic integrations, such as PhC surface-mode cavities and plasmonic couplers. The transmissivity/reflectivity setup is used for measuring the absorbance of metamaterial absorbers. This thesis presents mainly three nanophotonic devices, from fabrication to characterization. First, a PhC surface-mode cavity on a SOI structure is demonstrated. Through a side-coupling scheme, a system quality-factor of 6200 and an intrinsic quality-factor of 13400 are achieved. Such a cavity can be used as ultra-compact optical filter, bio-sensor and etc. Second, an ultra-thin, wide-angle metamaterial absorber at optical frequencies is realized. Experimental results show a maximum absorption peak of 88% at the wavelength of ~1.58μm. The ultra-fast photothermal effect possessed by such noble-metal-based nanostructure can potentially be exploited for making better solar cells. Finally, we fabricated an efficient coupler that channels light from a conventional dielectric waveguide to a subwavelength plasmonic waveguides and vice versa. Such couplers can combine low-loss dielectric waveguides and lossy plasmonic components onto one single chip, making best use of the two.
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| 7. |
- Wang, L, et al.
(författare)
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Bismuth-Related Nanostructures
- 2019
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Ingår i: Springer Series in Materials Science. - Singapore : Springer Singapore. - 2196-2812 .- 0933-033X. ; 285, s. 181-199
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Bismuth can modify surface reconstruction of III-V semiconductors and affect their growth conditions. Bismuth incorporation into III-Vs strongly changes their electronic properties. We present an overview of how the above Bi-related effects influence structural and optical properties of III-V nanostructures.
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