• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(2)
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• pp.71-74
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• 2001

Optical visual cryptography was proposed by conjunction of the optical theory with the cryptography. However, it had some difficulties. The problems occurred in the process of transferring data processing system from visual to optics. Therefore, it is appropriate to approach these problems in terms of optics. The results show that the optical visual cryptography system has both the effectiveness and reliability as well as real-time implementation property.

• 한국광학회:학술대회논문집
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• 한국광학회 2000년도 제11회 정기총회 및 00년 동계학술발표회 논문집
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• pp.65-65
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• 2000

Although it is difficult to predict the future engineers, including optical engineers, must do it on a regular basis. After all, what is the generation of a new optical design, but an attempt to predict what will be needed next year\ulcorner But optical engineers do not consult oracles or look into crystal balls, instead they look at past history, new research, and the trends in technology. This talk will use this approach to look at where optics will take us in this new century. (omitted)

• 한국광학회:학술대회논문집
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• 한국광학회 1996년도 Advance Program of 13th optics andquantum Electronics conference, 1996제13 회 광학 및 양자전자 학술 발표회 논문 요약집
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• pp.102-102
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• 1996

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2003년도 춘계학술발표논문집
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• pp.239-242
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• 2003

Scale down으로 인해 부족해진 overlay margin을 통해 충분히 확보해주고, 이와 동시에 attPSM(attenuated phase shift)의 사용으로 발생하는 side-lobe 현상을 억제하기 위한 방법으로 rule-based OPC(optical proximity correction)룰 사용하여 side-lobe만을 효과적으로 추출한 후, 그 자리에 scattering bar를 삽입하였다. 그리고 ORC(optical rule checking)를 통해 original layout과 aerial image의 EPEs(edge placement errors)를 검사하여 검증에 걸리는 시간을 감소시켰다.

• Journal of the Optical Society of Korea
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• 제12권4호
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• pp.240-243
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• 2008

Using the well-known Fokker-Planck method, this paper presents a standard way to find the joint-characteristic function for the first- and second-order polarization-mode-dispersion vectors originally derived by Foschini and Shepp. Compared with the Foschini and Shepp's approach, the Fokker-Planck approach gives a more accurate and straightforward way to find the joint-characteristic function.

• 한국광학회:학술대회논문집
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• 한국광학회 2002년도 하계학술발표회
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• pp.172-173
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• 2002

As feature sizes of circuits and devices approach 100 m and chip frequencies climb into the upper gigahertz to terahertz range, it becomes increasingly important to have a convenient method of characterizing properties of thin dielectric films in the GHz to THz frequency range [1]. To measure the dielectric and optical properties of materials at THz frequency, a TH2 time-domain spectroscopy has been utilized during past decade. (중략)

• 한국초전도ㆍ저온공학회논문지
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• 제15권1호
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• pp.14-18
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• 2013

We introduce a generic method to analyze optical 17reflectance spectra of strongly correlated electron systems including high-temperature superconductors by using an extended Drude model and Allen's approach. We explain the process step by step from reflectance through the optical conductivity and the scattering rate to the bosonic spectral function. Through the process we are able to get important information on the interactions between charge carriers from measured optical conductivity of the strongly correlated electron systems including copper oxide and iron pnitide high temperature superconductors.

• Current Optics and Photonics
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• 제7권3호
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• pp.248-253
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• 2023

An efficient global optimization approach for a periodic plasmonic nanoslit array based on extraordinary optical transmission within an acceptable time range is proposed using 𝚀 factor analysis method. The particle swarm optimization is employed as a global optimization tool. The figure of merit is defined as a product of transmission peak value and 𝚀 factor. The design variables are the slit width, height, and period of the slit array, respectively. The optical properties such as transmission spectrum and bandwidth are calculated rigorously using the finite element method.

• Smart Structures and Systems
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• 제1권1호
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• pp.63-82
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• 2005

This paper introduces a technology for robust and low maintenance cost sensor network capable to detect accelerations below a micro-g in a wide frequency bandwidth (above 1,000 Hz). Sensor networks with such performance are critical for navigation, seismology, acoustic sensing, and for the health monitoring of civil structures. The approach is based on the fabrication of an array of high sensitivity accelerometers, each utilizing Fabry-Perot cavity with wavelength-dependent reflectivity to allow embedded optical detection and serialization. The unique feature of the approach is that no local power source is required for each individual sensor. Instead one global light source is used, providing an input optical signal which propagates through an optical fiber network from sensor-to-sensor. The information from each sensor is embedded onto the transmitted light as an intrinsic wavelength division multiplexed signal. This optical "rainbow" of data is then assessed providing real-time sensing information from each sensor node in the network. This paper introduces the Fabry-Perot based accelerometer and examines its critical features, including the effects of imperfections and resolution estimates. It then presents serialization techniques for the creation of systems of arrayed sensors and examines the effects of serialization on sensor response. Finally, a fabrication process is proposed to create test structures for the critical components of the device, which are dynamically characterized.

• 융합신호처리학회논문지
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• 제11권1호
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• pp.32-40
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• 2010

확장된 네이보어-제르니케 방법을 이용하여 광학계의 동공함수(pupil function)를 추산하는 알고리즘을 제안한다. 동공함수로부터 광학계가 가진 파면수차를 복원하고 아울러 동공에 비추어지는 빛의 밝기분포를 분석할 수 있다. 이 방법은 브루-레이 광픽업의 생산현장에 적용하여 실시간으로 광학계의 수차를 복원할 수 있다. 아울러 이 방법이 여러 다른 광학계에 널리 이용될 수 있음을 다양하게 수차를 부여해서 생성한 데이터를 분석하여 검증하였다. 초점영역의 빔 데이터로부터 동공함수를 얻는 역변환의 여러 방법 중에서 수차이론에 근거한 기존의 네이보어-제르니케 방법을 최근에 네덜란드 연구진이 개량한 확장된 네이보어-제르니케(extended Nijboer-Zernike: ENZ) 방법을 제안하였다. ENZ 방법은 초점영역의 3차원 빔 데이터로부터 해석적인 접근을 통하여 동공의 제르니케 계수를 효율적으로 계산해 낸다. 그러나 이 방법에서는 개구수(NA)가 큰 경우에는 근사적인 접근을 하도록 되어 있다. 본 연구에서는 보다 일반적인 상황에서 적용할 수 있는 수치해석 알고리즘을 개발하고, 이를 GUI 환경에서 운용할 수 있는 윈도 기반의 프로그램을 작성하여 생성한 빔 데이터에 적용하여 이 알고리즘의 유효성을 검증하여 13개의 복소 수차인자 $\beta_n^m$이 모든 요소가 0.7까지 분석을 하였고, 아울러 광픽업의 3D 빔 데이터를 실측해서 간섭계로 측정한 데이터와 R=0.98 정도의 상관관계를 가지는 것을 확인하였다.