Dr. Ik-Bu Sohn Profile

Dr. Ik-Bu Sohn

Principal Research Scientist at Gwangju Institute of Science and Technology

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Author

Publications (16)

SPIE Journal Paper | 28 November 2020

Improvement of light intensity and efficiency of n-ZnO/NiO/p-GaN heterojunction-based white light emitting diodes using micro-/nanolens array

Apurba Adhikary, Md. Shamim Ahsan, Md. Mahbub Hossain, Md. Bipul Hossain, S.H. Shah Newaz, Farid Ahmed, Ik-Bu Sohn

OE, Vol. 59, Issue 11, 117108, (November 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.11.117108

KEYWORDS: Light emitting diodes, Electroluminescence, Spherical lenses, External quantum efficiency, Near field, Refractive index, Optical engineering, Visible radiation, Gallium nitride, Zinc oxide

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SPIE Journal Paper | 11 September 2020

Femtosecond laser-assisted fabrication of microstrip patch antenna

Young-Jun Jung, Hun-Kook Choi, Bong Ahn Yu, Jongyeol Kim, Cherlhee Lee, Md. Shamim Ahsan, Ik-Bu Sohn

OE, Vol. 59, Issue 09, 096103, (September 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.9.096103

KEYWORDS: Antennas, Femtosecond phenomena, Laser applications, Fabrication, Ultraviolet radiation, Optical lithography, Wet etching, Optical engineering, Optical simulations, Printing

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SPIE Journal Paper | 19 February 2019

Design and analysis of intense light beam by microlens engraved optical fiber

Rabita Hasan, Md. Shamim Ahsan, Md. Maniruzzaman, Md. Mahbub Hossain, Ragib Shakil Rafi, Ik-Bu Sohn

OE, Vol. 58, Issue 02, 027114, (February 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.2.027114

KEYWORDS: Optical fibers, Microlens, Near field, 3D modeling, Model-based design, Spherical lenses, Optical engineering, 3D image processing, Mendelevium, Phototherapy

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SPIE Journal Paper | 19 February 2015

Vertical waveguide structure optical printed circuit board based on a low-dielectric and transparent PCB materials

Sung Hwan Hwang, Woo-Jin Lee, Jong Bae An, Gye Won Kim, Myoung Jin Kim, Eun Joo Jung, Young Ho Kim, Ki Young Jung, Ik-Bu Sohn, Byung Sup Rho

OE, Vol. 54, Issue 02, 025112, (February 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.2.025112

KEYWORDS: Waveguides, Copper, Optical printed circuit boards, Transparency, Data transmission, Optical interconnects, Surface roughness, Geometrical optics, Refractive index, Vertical cavity surface emitting lasers

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SPIE Journal Paper | 14 May 2014

Fabrication of Fresnel zone plate lens in fused silica glass using femtosecond laser lithography technology

Ik-Bu Sohn, Md. Shamim Ahsan, Young-Chul Noh, Hun-Kook Choi, Jin-Tae Kim, Myeong-Jin Ko

OE, Vol. 53, Issue 05, 055107, (May 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.5.055107

KEYWORDS: Femtosecond phenomena, Glasses, Lithography, Silica, Diffraction, Helium neon lasers, Zone plates, Laser applications, Fabrication, Coating

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Proceedings Article | 7 December 2013 Paper

Formation of cylindrical micro-lens array in fused silica glass using laser irradiations

Hun-Kook Choi, Md. Shamim Ahsan, Dongyoon Yoo, Ik-Bu Sohn, Young-Chul Noh, Jin Tae Kim, Deok Jung, Jin Hyeok Kim

Proceedings Volume 8923, 89234T (2013) https://doi.org/10.1117/12.2033772

KEYWORDS: Glasses, Diffraction, Carbon dioxide lasers, Silica, Polishing, Femtosecond phenomena, Surface finishing, Laser systems engineering, Optical lithography, Laser applications

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Proceedings Article | 7 December 2013 Paper

Fabrication of Fresnel zone plate lens in fused silica glass using femtosecond laser lithography technology

Ik-Bu Sohn, Md. Shamim Ahsan, Young-Chul Noh, Hun-Kook Choi, Jin-Tae Kim, Myeong Jin Ko

Proceedings Volume 8923, 89233Y (2013) https://doi.org/10.1117/12.2033766

KEYWORDS: Zone plates, Femtosecond phenomena, Glasses, Lithography, Silica, Diffraction, Laser applications, Fabrication, Photoresist materials, Optical lithography

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SPIE Journal Paper | 1 November 2012

Relationship between the order of rotation symmetry in perforated apertures and terahertz transmission characteristics

Joong-Wook Lee, Jin-Kyu Yang, Ik-Bu Sohn, Hun-Kook Choi, Chul Kang, Chul-Sik Kee

OE, Vol. 51, Issue 11, 119002, (November 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.11.119002

KEYWORDS: Terahertz radiation, Polarization, Photonics, Optical engineering, Electromagnetism, Metals, Optical components, Scanning electron microscopy, Electronics, Biotechnology

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Proceedings Article | 15 October 2012 Paper

Polarization-independent terahertz three-dimensional subwavelength confinement in coupled slot structures

Joong-Wook Lee, Jin-Kyu Yang, Jeong Eun Kim, Ik-Bu Sohn, Hun-Kook Choi, Chul Kang, Chul-Sik Kee

Proceedings Volume 8496, 849610 (2012) https://doi.org/10.1117/12.929325

KEYWORDS: Terahertz radiation, Polarization, Electromagnetism, Near field, Metals, Plasmonics, Diffraction, Imaging spectroscopy, Dielectric polarization, Structural design

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SPIE Journal Paper | 1 February 2009

Direct femtosecond laser lithography for photoresist patterning

Ik-Bu Sohn, Myeong-Jin Ko, Young-Seop Kim, Young-Chul Noh

OE, Vol. 48, Issue 02, 024301, (February 2009) https://doi.org/10.1117/12.10.1117/1.3081094

KEYWORDS: Femtosecond phenomena, Lithography, Optical lithography, Pulsed laser operation, Photoresist materials, Scanning electron microscopy, Laser energy, Maskless lithography, Photomasks, Submicron lithography

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Proceedings Article | 26 February 2008 Paper

Precision microfabrication of AlN and Al2O3 ceramics by femtosecond laser ablation

Sung Hoon Kim, T. Balasubramani, Ik-Bu Sohn, Yong-Chul Noh, Jongmin Lee, Jee Bum Lee, Sungho Jeong

Proceedings Volume 6879, 68791O (2008) https://doi.org/10.1117/12.762701

KEYWORDS: Laser drilling, Aluminum nitride, Ceramics, Femtosecond phenomena, Laser ablation, Laser energy, Laser processing, Pulsed laser operation, Laser applications, Particles

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Proceedings Article | 18 February 2008 Paper

Side-imaging lensed photonic crystal fiber probe

Hae Young Choi, Seon Young Ryu, Jihoon Na, Byeong Ha Lee, Ik-Bu Sohn, Young-Chul Noh, Jongmin Lee

Proceedings Volume 6847, 68472F (2008) https://doi.org/10.1117/12.766349

KEYWORDS: Optical fibers, Optical coherence tomography, Polishing, Photonic crystal fibers, Imaging systems, Near field optics, Surface finishing, Mirrors, Optical imaging, Free space optics

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Proceedings Article | 22 January 2005 Paper

Fabrication of three-dimensional photonic devices using femtosecond laser pulses

Ik-Bu Sohn, Man-Seop Lee, Sang-Man Lee, Jung-Sik Woo, Jung-Yong Jung

Proceedings Volume 5715, (2005) https://doi.org/10.1117/12.588501

KEYWORDS: Femtosecond phenomena, Glasses, Waveguides, Silica, Microscopes, Near field optics, Optical alignment, Diffraction gratings, Pulsed laser operation, Absorption

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Proceedings Article | 8 October 2004 Paper

Fabrication of photonic devices directly written in glass using femtosecond laser pulses

Ik-Bu Sohn, ManSeop Lee, Suk-Jae Jee

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596340

KEYWORDS: Waveguides, Glasses, Femtosecond phenomena, Silica, Refractive index, Wave propagation, Absorption, Photonic devices, Pulsed laser operation, Microscopes

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Proceedings Article | 8 October 2004 Paper

Application of femtosecond pulsed laser for optical devices

Suk-Jae Jee, Jung-Sik Woo, Ik-Bu Sohn, ManSeop Lee

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596339

KEYWORDS: Photonic integrated circuits, Femtosecond phenomena, Micromachining, Pulsed laser operation, Waveguides, Optical components, Optical fibers, Packaging, Laser applications, Laser systems engineering

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SPIE Journal Paper | 1 July 2002

Tunable gain-flattening filter using microbending long-period fiber gratings

Ik-Bu Sohn, Namkwon Lee, Hyungwoo Kwon, Jaewon Song

OE, Vol. 41, Issue 07, (July 2002) https://doi.org/10.1117/12.10.1117/1.1481899

KEYWORDS: Optical amplifiers, Optical filters, Tunable filters, Fiber amplifiers, Cladding, Wavelength division multiplexing, Polarization, Solids, Electronics engineering, Optical fibers

Showing 5 of 16 publications

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