Myeongkyu Lee

Tunable structural colors have diverse applications ranging from displays and photovoltaics to surface decoration and art. A metal–insulator–metal (MIM) cavity structure formed by thin continuous layers has drawn great interest as a lithography-free and scalable optical structure to control light transmission and reflection at the surface of a material. However, the production of distinct reflection colors from the structure is challenging because the typical MIM cavity absorbs a narrow waveleng

Abstract Engineering the thermal emission of a material in the long‐wavelength infrared (IR) range is applicable to a wide variety of fields, including IR‐adaptive camouflage, information encryption, radiative cooling, energy‐saving windows, and personal thermal management. Although many different materials or structures have been proposed for these purposes, the position‐selective dynamic control of their thermal emission remains a significant challenge. Herein, a laser printing method is prese

X-ray diffraction is a useful and powerful analysis technique for characterizing crystalline materials commonly employed in MSE, physics, and chemistry. This informative new book describes the principles of X-ray diffraction and its applications to materials characterization. It consists of three parts. The first deals with elementary crystallography and optics, which is essential for understanding the theory of X-ray diffraction discussed in the second section of the book. Part 2 describes how

Porosity values between 0.12 and 0.40 are achieved in a controllable way for TiO2 electrodes in dye-sensitized solar cells by irradiation with a pulsed Nd:YAG laser at 1064 nm. Whereas the electron lifetime and diffusion distance increase with reduced porosity, the amount of adsorbed dyes remains almost constant. This greatly enhances the photocurrent density and energy conversion efficiency of the solar cell. Detailed facts of importance to specialist readers are published as ”Supporting Inform

X-ray diffraction is a useful and powerful analysis technique for characterizing crystalline materials commonly employed in MSE, physics, and chemistry. This informative new book describes the principles of X-ray diffraction and its applications to materials characterization. It consists of three parts. The first deals with elementary crystallography and optics, which is essential for understanding the theory of X-ray diffraction discussed in the second section of the book. Part 2 describes how

Plasmonic color laser printing has several advantages over pigment-based technology, including the absence of ink and toner and the production of nonfading colors. However, the current printing method requires a template that should be prepared via nanofabrication processes, making it impractical for large-area color images. In this study, we show that laser-induced dewetting of metal thin films by a nanosecond pulsed laser can be effectively utilized for plasmonic color printing. Ag, Au, and th

We have found that Tb-doped near-stoichiometric LiNbO3 crystals have three different types of energy levels: ultraviolet (UV) absorption centers just above the valence band, shallow electron traps slightly below the conduction band, and deep traps located about 1.9 eV (λ≈650 nm) below it. Using this shallow trap as an intermediate energy state, two-color holographic recording has been carried out at λ=852 nm with a UV gating light at 313 nm. A few % of diffraction efficiency was achieved, and th