Opt Express
Laboratory of Photonics and Microwave Engineering, School of Information and Communication Technology, Royal Insitute of Technology (KTH), Electrum 229, Kista 16440, Sweden.
Published: February 2011
We describe a layered metal-dielectric waveguide, whose fundamental mode has an effective index as high as 7.35 at 1.55 μm, enabling subwavelength spatial confinement. The loss is found to be reasonable in relation to the confinement. The indefinite dielectric tensor of the stratified metamaterial core generally leads to multimode operation of the waveguide, exhibiting a "reversed" mode ordering contrary to conventional waveguides. The waveguide features a strong leveraging in modal index change subject to a change of index in the dielectric layers, opening the design possibilities of very compact active electro-optic devices.
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http://dx.doi.org/10.1364/OE.19.003818 | DOI Listing |
Sci Rep
January 2025
Department of Electrical and Computer Engineering, Aarhus University, Aarhus, 8200, Denmark.
Significant progress has been made through the optimization of modelling and device architecture solar cells has proven to be a valuable and highly effective approach for gaining a deeper understanding of the underlying physical processes in solar cells. Consequently, this research has conducted a two-dimensional (2D) perovskite solar cells (PSCs) simulation to develop an accurate model. The approach utilized in this study is based on the finite element method (FEM).
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January 2025
Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315000, China.
Power generation and architectural beauty are equally important for designing efficient and esthetically appealing bifacial perovskite solar cells (PSCs). In this work, efficient and multicolored p-i-n-structured PSCs are achieved by taking advantage of a dielectric/metal/dielectric (DMD)-type (MoO/Ni/Ag/MoO) transparent counter electrode. The MoO/Ni underlayer effectively promotes the formation of a continuous and conductive ultrathin Ag transparent film, especially the 1 nm Ni seed layer adjusts the interface energy level between perovskite/MoO and Ag, resulting in Ohmic contact of the electrode to promote charge extraction and collection.
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November 2024
CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, Toulouse Cedex, 31055, France.
We report a broadband metal-dielectric dispersive mirror (MDDM) based on Al/SiO/HfO thin films operating in the near-ultraviolet (UV) region. Demonstrating the combined benefits of both the wide reflective bandwidth of aluminum in the UV region and the flexible dispersion control capability of HfO/SiO multilayer films, the MDDM has a wide bandwidth, low total thickness, and precise dispersion compensation ability. We propose an initial design based on a shortwave reflection enhancement structure (SWRES) to prevent shortwave light from obtaining a second time-dispersion compensation in the deep metal layer.
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