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  1. No Access

    Article

    Terahertz generation in quasi-phase-matching structures

    Quasi-phase-matching (QPM) technology is considered one of the efficient ways to generate a coherent narrowband terahertz (THz) source. This review addresses two main QPM structures, such as periodically poled...

    Nan Ei Yu in Journal of the Korean Physical Society (2022)

  2. Article

    Open Access

    All-optical THz wave switching based on CH3NH3PbI3 perovskites

    Hybrid structures of silicon with organic–inorganic perovskites are proposed for optically controllable switching of terahertz (THz) waves over a broad spectral range from 0.2 to 2THz. A 532-nm external laser ...

    Kyu-Sup Lee, Rira Kang, Byungwoo Son, Dong-Yu Kim, Nan Ei Yu… in Scientific Reports (2016)

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  3. No Access

    Article

    Study of an optical device based on a quasi-phase-matching method for speckle noise reduction for laser display

    We report on quasi-phase-matched devices design of a red, green and blue (RGB) laser source based on second harmonic generation by using a novel apodized step-chirped grating (ASCG) made from various nonlinear...

    Seong-** Son, Do-Kyeong Ko, Nan Ei Yu in Journal of the Korean Physical Society (2016)

  4. Article

    Open Access

    Morphological and SERS Properties of Silver Nanorod Array Films Fabricated by Oblique Thermal Evaporation at Various Substrate Temperatures

    Aligned silver nanorod (AgNR) array films were fabricated by oblique thermal evaporation. The substrate temperature during evaporation was varied from 10 to 100 °C using a home-built water cooling system. Depo...

    Myoung-Kyu Oh, Yong-Seok Shin, Chang-Lyoul Lee, Ranjit De… in Nanoscale Research Letters (2015)

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  5. No Access

    Article

    Characterization of in-situ terahertz detection by optical interaction in a periodically poled stoichiometric lithium tantalate nonlinear crystal

    Terahertz waves are generated using a femtosecond laser pulse in a periodically poled stoichiometric lithium tantalate crystal and simultaneously detected via a non-collinear optical parametric interaction ins...

    Kyu-Sup Lee, Do-Kyeong Ko, Shunji Takekawa… in Journal of Infrared, Millimeter, and Terah… (2014)

  6. No Access

    Chapter and Conference Paper

    Development of Laser Wavelength Conversion Devices for Selective Ablation of Dental Caries

    From the direct measurement of the onset energy density of the photoablation from 460 nm to 600 nm, it is found that wavelength between 520 nm to 560 nm has the best ablation selectivity. With the variations o...

    Jung Hoon Ro, Gyerok Jeon, Changsoo Jung… in World Congress on Medical Physics and Biom… (2007)