• Title/Summary/Keyword: nonlinear optics

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Gold-sapphire Plasmonic Nanostructures for Coherent Extreme-ultraviolet Pulse Generation

  • Han, Seunghwoi
    • Current Optics and Photonics
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    • v.6 no.6
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    • pp.576-582
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    • 2022

  • Plasmonic high-order harmonic generation (HHG) is used in nanoscale optical applications because it can help in realizing a compact coherent ultrashort pulse generator on the nanoscale, using plasmonic field enhancement. The plasmonic amplification of nanostructures induces nonlinear optical phenomena such as second-order harmonic generation, third-order harmonic generation, frequency mixing, and HHG. This amplification also causes damage to the structure itself. In this study, the plasmonic amplification according to the design of a metal-coated sapphire conical structure is theoretically calculated, and we analyze the effects of this optical amplification on HHG and damage to the sample.

  • https://doi.org/10.3807/COPP.2022.6.6.576 인용 PDF KSCI

Low-threshold Optical Bistability Based on Bound States in the Continuum

  • Kim, Myunghwan;Kim, Sangin;Kim, Soeun
    • Current Optics and Photonics
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    • v.6 no.1
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    • pp.10-14
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    • 2022

  • Low-threshold optical bistability is essential for practical nonlinear optical applications. Many bistable optical devices based on high-quality-factor resonators have been proposed to reduce the threshold intensity. However, demonstrating high-quality-factor resonance requires complex fabrication techniques. In this work, we numerically demonstrate optical bistability with bound states in the continuum in a simple one-dimensional Si photonic crystal. The designed structure supports bound states in the continuum, producing an ultrahigh quality factor without tough fabrication conditions. The threshold intensity of the designed device is 150 MW/cm2 at the optical communication wavelength. This scheme may lead to a new class of nonlinear photonics.

  • https://doi.org/10.3807/COPP.2022.6.1.010 인용 PDF KSCI

Theory of Optical Second Harmonic Generation from Al Metal Surfaces

  • Lee, Kyungmee;Lee, Hyungrak;Choi, Seongsoo
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.199.1-199.1
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    • 2014

  • In nonlinear optics, the properties of nonlinear optical responses such as polarization and nonlinear analysis of the nonlinear surfaces were investigated using the jellium model by optical second harmonic generation. The nonlinear response of the Al metal surfaces were calculated using TDLDA. Band structure, lattice constant and bulk modulus of the Al metal were investigated. Effective potential and electron density were compared by changing different.

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