Dr. Sang-Pil Han Profile

Dr. Sang-Pil Han

at ETRI

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Publications (12)

Proceedings Article | 23 April 2017 Paper

Terahertz radiation based on fiber-pigtailed InGaAs photoconductive antenna pumped by 1030-nm mode-locked Yb-doped fiber laser

Ji Su Kim, Sang-Pil Han, Kiwon Moon, Han-Cheol Ryu, Kyung Hyun Park, Min Yong Jeon

Proceedings Volume 10323, 103237V (2017) https://doi.org/10.1117/12.2265379

KEYWORDS: Free space, Terahertz radiation, Mode locking, Fiber lasers, Antennas, Indium gallium arsenide, Principal component analysis, Picosecond phenomena, Free space optics, Diffraction gratings

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Proceedings Article | 2 May 2016 Paper

Terahertz generation and detection using femtosecond mode-locked Yb-doped fiber laser

Moon Sik Kong, Ji Su Kim, Sang-Pil Han, Namje Kim, Ki Won Moon, Kyung Hyun Park, Min Yong Jeon

Proceedings Volume 9747, 97471B (2016) https://doi.org/10.1117/12.2212114

KEYWORDS: Fiber lasers, Mode locking, Terahertz radiation, Semiconductor lasers, Single mode fibers, Receivers, Femtosecond phenomena, Femtosecond fiber lasers, Indium gallium arsenide, Antennas, Polarization

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Proceedings Article | 14 March 2015 Paper

Portable terahertz scanner for imaging and spectroscopy using InP-related devices

Kyung Hyun Park, Namje Kim, Il-Min Lee, Kiwon Moon, Eui Su Lee, Hyunsung Ko, Won-Hui Lee, Sang-Pil Han

Proceedings Volume 9362, 93620V (2015) https://doi.org/10.1117/12.2081356

KEYWORDS: Terahertz radiation, Imaging spectroscopy, Sensors, Antennas, Scanners, Imaging systems, Laser sintering, Principal component analysis, Diodes

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Proceedings Article | 7 March 2014 Paper

Photonic devices for tunable continuous-wave terahertz generation and detection

Kyung Hyun Park, Namje Kim, Kiwon Moon, Hyunsung Ko, Jeong-Woo Park, Eui Su Lee, Il-Min Lee, Sang-Pil Han

Proceedings Volume 8985, 898506 (2014) https://doi.org/10.1117/12.2045639

KEYWORDS: Terahertz radiation, Laser sintering, Continuous wave operation, Diodes, Waveguides, Sensors, Glasses, Semiconductors, Semiconductor lasers

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Proceedings Article | 27 March 2013 Paper

A tunable continuous-wave terahertz generator based on 1.3 μm dual-mode laser diode and travelling-wave photodiode

Han-Cheol Ryu, Namje Kim, Jung-Woo Park, Sang-Pil Han, Hyunsung Ko, Kiwon Moon, Min Yong Jeon, Kyung Hyun Park

Proceedings Volume 8624, 862407 (2013) https://doi.org/10.1117/12.2001964

KEYWORDS: Terahertz radiation, Semiconductor lasers, Photodiodes, Continuous wave operation, Laser sintering, Indium gallium arsenide, Antennas, Homodyne detection, Waveguides

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Proceedings Article | 1 March 2012 Paper

Portable terahertz spectrometer with InP related semiconductor photonic devices

Kyung Hyun Park, Namje Kim, Hyunsung Ko, Han-Cheol Ryu, Jung-Woo Park, Sang-Pil Han, Min Yong Jeon

Proceedings Volume 8261, 826103 (2012) https://doi.org/10.1117/12.907629

KEYWORDS: Terahertz radiation, Antennas, Silicon, Phase shifts, Laser sintering, Photonic devices, Indium gallium arsenide, Spectroscopy, Continuous wave operation

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Proceedings Article | 4 October 2006 Paper

Optical transmitter module using polymer waveguide with fully integrated reflector mirrors

In-Kui Cho, Seoung-Ho Ahn, Woo-Jin Lee, Sang-Pil Han, Byeong-Soo Bae, Keun Byoung Yoon, Myung-Yung Jeong, Hyo Hoon Park

Proceedings Volume 6351, 635116 (2006) https://doi.org/10.1117/12.688493

KEYWORDS: Waveguides, Reflectors, Mirrors, Transmitters, Optics manufacturing, Surface finishing, Ultraviolet radiation, Vertical cavity surface emitting lasers, Polishing, Polymer multimode waveguides

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The cost-effective and repeatable technology for integration of polymer multimode waveguide and out-of-plane 45° reflector mirrors is developed. This method is cost-effective, repeatable, robust, and fully compatible with the standard manufacturing processes for a 90° optical bending structure. The basic concept of the technology for integration of waveguide and out-of-plane 45° reflector mirrors is as follows; 1) The positively patterned master in order to mold waveguides is manufactured by using photolithography and Deep RIE (Reactive Ion Etching). And the master is polished to obtain 45°-inclined plane. 2) Both sides of the positively patterned master are divided into three parts by using a sawing machine. One is a center master (main-master) with a positively patterned waveguide and the others are side masters (sub-master) without a pattered waveguide. The main master and sub-master turned over get back together again. 3) The negatively patterned PDMS master to be able to mold simultaneously both waveguide and out-of-plane 45° reflector mirrors is manufactured through pouring PDMS gel into master and thermally curing the PDMS master. 4) The multimode tapered waveguides with out-of-plane 45° reflector mirrors are simultaneously embossed by using PDMS master. The UV (Ultraviolet) curable material is organic-inorganic hybrid material (HYBRIMER, core index: 1.51, clad index: 1.48). The transmitter module is constructed on a MOB. The MOB was employed for several purposes; to align optical module passively, to use as heat sinker and also to support the boards. On this MOB, 1×4 arrays of vertical-cavity surface-emitting laser (VCSEL) and Tapered Waveguide with 45° reflector mirrors are integrated. The height and width of waveguide's core are 100 μm, 60 μm respectively and the pitch is 250 μm. The transmission access lines in transmitter are designed considering differential impedance matching for high-speed operation. We measured the insertion loss of this transmitter module using a 62.5 μm graded index fiber. The average insertion loss value is roughly about 7dB.

Proceedings Article | 3 October 2006 Paper

Index modulation type waveguides written by laser direct writing technology

Woo-Jin Lee, In-Kui Cho, Sang-Pil Han, Woo-Soo Kim, Byeong-Soo Bae, Seoung-Ho Ahn

Proceedings Volume 6351, 635117 (2006) https://doi.org/10.1117/12.688762

KEYWORDS: Waveguides, Modulation, Refractive index, Laser applications, Etching, Organic hybrid materials, Wave propagation, Cladding, Polymers, Atomic force microscopy

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In this paper, we describe the cost-effective and simplified fabrication of an index modulation type buried waveguide using laser direct writing. Our studies have a potential of manufacturing waveguides on an uneven surface and a large area because there is no need for photo-mask, etching and development processes. We used organic-inorganic hybrid materials (HYBRIMER) for the fabrication of the waveguides, which have a high transparency from a visible region to an infrared region. We exposed the core layer (HYBRIMER) to a focused laser beam after a one-step spin coating process on a buffer layer. The silicon oxide was used as a buffer layer. The refractive index of the HYBRIMER film is increased by exposure from a laser beam. Therefore, the refractive index of the exposed region is higher than that of the unexposed region, which forms the index modulation type waveguide without an etching process. The fabricated waveguide channels were baked at 120°C during 3hrs for stabilization of the organic and inorganic networks. The laser direct writing apparatus was used to produce the pattern of waveguide channels. This system consists of a He-Cd laser radiating 325nm beam, high-resolution computer-controlled translation stages and a video camera that images the sample onto a monitor. The pattern of the waveguide channel was written using various writing speeds to optimize the writing condition. The core section of optimized waveguides was a rectangular shape and the core dimension was 7μm wide and 8μm high. The refractive index is increased from 1.495 to 1.5 after exposure. The difference of the refractive index between the core and cladding was approximately 0.33%. The insertion loss of the waveguides was measured by cut-back method using a single-mode fiber as an input tip, a multimode fiber (50 μm GI) as an output tip, and a 1310nm wavelength laser light source. The insertion loss shows a linear relationship with the length of the waveguide. The propagation loss of the buried waveguide was approximately 0.3dB/cm at a wavelength of 1310nm.

SPIE Journal Paper | 1 August 2006

Demonstration of high-speed transmission through waveguide-embedded optical backplane

Seung-Ho Ahn, In-Kui Cho, Sang-Pil Han, Keun Byoung Yoon, Man-Seop Lee

OE, Vol. 45, Issue 08, 085401, (August 2006) https://doi.org/10.1117/12.10.1117/1.2338557

KEYWORDS: Waveguides, Transmitters, Receivers, Polymers, Polymer multimode waveguides, Vertical cavity surface emitting lasers, Optical interconnects, Eye, Packaging, Telecommunications

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Proceedings Article | 17 November 2005 Paper

Transmission characteristics of waveguide-embedded optical backplane system

Seung-Ho Ahn, In-Kui Cho, Woo-Jin Lee, Sang-Pil Han, Keun-Byoung Yoon, Myung-Yung Jeong, Man-Seop Lee

Proceedings Volume 5999, 59990X (2005) https://doi.org/10.1117/12.630313

KEYWORDS: Waveguides, Receivers, Transmitters, Polymer multimode waveguides, Polymers, Vertical cavity surface emitting lasers, Eye, Telecommunications, Optics manufacturing, Optical interconnects

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Proceedings Article | 25 October 2005 Paper

Fully optical backplane system using novel optical plug and slot

In-Kui Cho, Seung-Ho Ahn, Woo-Jin Lee, Sang-Pil Han, Jin-Tae Kim, Chun-Ki Choi, Kyung-Up Shin, Keun Byoung Yoon, Myung-Yung Jeong, Hyo Hoon Park

Proceedings Volume 6014, 60140I (2005) https://doi.org/10.1117/12.630311

KEYWORDS: Waveguides, Polymer multimode waveguides, Polymers, Transmitters, Receivers, Optical printed circuit boards, Metals, Active optics, Data transmission, Optical alignment

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Proceedings Article | 25 October 2004 Paper

Hot-embossed polymeric optical waveguides

Choon-Gi Choi, Jin-Tae Kim, Sang-Pil Han, Seung-Ho Ahn

Proceedings Volume 5595, (2004) https://doi.org/10.1117/12.571145

KEYWORDS: Polymers, Waveguides, Polymer multimode waveguides, Optical interconnects, Silicon, Polymer optical fibers, Vertical cavity surface emitting lasers, Transmitters, Optical alignment, Receivers

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Showing 5 of 12 publications

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