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Dive into the research topics where Heeseong Jeong is active.

Publication


Featured researches published by Heeseong Jeong.


Optics Communications | 2002

Complete mapping of complex reflection coefficient of a surface using a scanning homodyne multiport interferometer

Heeseong Jeong; Jong-Hoi Kim; Kyuman Cho

We present a novel multiport coherent optical detection scheme which can simultaneously measure phase and amplitude of a signal beam. Using a scanning interferometer arrangement, we were able to map local variations of magnitude and phase of the complex reflection coefficient of a surface or thin film. We will show that this scheme can be used not only for locating defects on the surface but also for identifying the nature of defects.


Review of Scientific Instruments | 2003

Actively stabilized optical feedback scheme for very stable, high sensitivity shear-force measurement

Heeseong Jeong; Noh-Min Kwak; Hyeongjun Huh; Kyuman Cho

We present here an active feedback control scheme which can maintain the distance between a laterally vibrating tapered optical fiber tip (TOFT) and a one facet of a laser diode (LD) at optimum value to measure the vibration amplitude of the TOFT in an optical feedback shear-force measurement scheme. Extremely good sensitivity for measuring the vibration amplitude, 9.58×10−2 pm/√Hz for a metal coated TOFT, can be maintained for at least 6 h by use of an active stablization scheme. Using a linearized lasing model of the LD in the presence of optical feedback, we are able to determine the vibration amplitude and effective reflection coefficient of the TOFT.


Frontiers in Optics | 2003

Observations of vectorial effects in multiple filamentation using a near-field scanning optical microscope

Heeseong Jeong; Sung-Tae Hwang; Kyuman Cho

Effect of the initial polarization state of an axially symmetric beam propagating through a self-focusing medium has been observed by the use of a near-field scanning optical microscope (NSOM). As predicted in the theory of vectorial effects, a circularly polarized beam is likely to suppress multiple filamentation (MF).


Optics Communications | 2005

Quantitative analysis of photoinduced phenomena in amorphous As2S3 thin films using the scanning homodyne multiport interferometer

Heeseong Jeong; Sung-Tae Hwang; Kyuman Cho


Archive | 2012

Organic light emitting diode display and optical component

Soon-Ryong Park; Woo-Suk Jung; Heeseong Jeong; Eun-ah Kim; Hee-Chul Jeon; Chul-Woo Jeong; Noh-Min Kwak; Joo-Hwa Lee


Archive | 2011

Polarizing plate and organic light-emitting device including the same

Il-Ryong Cho; Chul-Woo Jeong; Heeseong Jeong; Woo-Suk Jung; Tae-Kyu Kim; Sung-Soo Koh; Soon-Ryong Park; 憙星 丁; 順龍 朴; 一龍 趙; 又碩 鄭; 哲宇 鄭; 泰奎 金; 晟洙 高


Archive | 2002

Alignment method of the optical transmitter and receiver in the optical wireless communication system

Kyuman Cho; Youngwan Choi; Heeseong Jeong


Archive | 2011

Sealing inspection device and sealing inspection method of flat panel display apparatus by using the sealing inspection device

Soon-Ryong Park; Woo-Suk Jung; Heeseong Jeong; Tae-Kyu Kim; Sun-Hwa Kim


Microwave and Optical Technology Letters | 2004

Wide-Tuning-Range K-Band Microwave-Photonic VCO Using an All-Optical Heterodyne Scheme

Noh-Min Kwak; Hyeongjun Huh; Heeseong Jeong; Kyuman Cho


Archive | 2012

Organische lichtemittierende Diodenanzeigevorrichtung und Verfahren zu ihrer Herstellung An organic light emitting diode display device and process for their preparation

Heeseong Jeong; Sun-Hwa Kim; Soon-Ryong Park

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