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5월 18 일 ( 금) using the fluorescent lamp with hundred lights, the light is preponderated with one place, there is a weak point must use the war potential which is high. And the thickness is thick and the weight is heavy. 15:40 F3B-4 탄소나노튜브 기반의 신개념 엑스선 광 원개발 최해영, 김종욱(KERI) Since its discovery, carbon nanotube (i.e., CNT) has been extensively studied because of its physical, chemical, and mechanical merits and it has been applied instantly for many fields such as field emission display (FED), nanoscale bio-sensor, vacuum electronicdevices,andsoon.Recently,CNT has been applied for x-ray source as a cold emitter. In this study, we report a new CNT based field emission x-ray source in which CNT emitter can be easily detached or attached into the x-ray tube while the x-ray tube is operating. The main advantage of it is when CNT emitters have problems in the x-ray tube it can be easily replaced with new one without any big efforts. Detailed descriptions of it and some preliminary x-ray images obtained in this study are reported. 15:55 F3B-5 탄소나노튜브 기반 엑스선 광원의 특성 최해영, 김종욱(KERI) Studies on the electronic structure of carbon nanotube (CNT) are of much importance because of its efficient utilization in electronic vacuum devices[1]. These CNTs have many applications such as field emission display (FED), LCD backlight units, microwave amplifiers, lighting lamps, and so on. One of potential applications is the electron emitter for x-ray source. In order to obtain x-ray images of relatively hard material or components, high quantity of x-ray current is generally required. In this study, we report that the current density of x-ray source can be greatly enhanced by using the CNT emitter as a cathode. In general, the emission current of CNT emitter is very sensitive to gap distance between CNT emitter and grid metalmesh,andsoon.Extensiveresultsof these were reported in our recent works[2]. Detailed parameters and corresponding results were presented and some preliminary characteristics of the x-ray source were reported in this study 학술발표 F3C 사라세미나실 나노/ 바이오포토닉스 III 14:40~15:40 좌장 : 정병조( 연세대) 14:40( 초청논문) F3C-1 광학을 이용한 연골의 진단과 치료 윤종인( 대구가톨릭대) In optical diagnostics for cartilage, electronkinetic displacement and optical phase delays depending on applied excitation voltage and frequency were measured in cartilage using differential phase optical coherence tomography (DP-OCT). The investigation of electrokinetic behavior using DP-OCT may be used to develop a non -invasive optical technique for providing a sensitive indicator of cartilage viability on the molecular-level and possibly detecting early degradative changes in cartilage associated with osteoarthritis. For a full understanding of the nature and degree of cartilage degeneration with a joint, 3-D OCT was also used to demonstrate surface topography and subsurface disruption of articular cartilage. The 3-D OCT volumetric imaging of cartilage provides an enhanced appreciation and better understanding of regional degenerative joint disease than may be realized by conventional 2-D OCT sectional images. In optical therapeutics of cartilage, laser ablation was performed using different wavelengths based on optical absorption of cartilage. The results showed that the wavelength dependence of cartilage ablation depends on the wavelength and the wavelength where both protein and water are absorbed was the most efficient wavelength for cartilage ablation. 15:10( 초청논문) F3C-2 근적외선을 이용한 인체 피하지방층, 맥파, 스트레스 관련 정보 추출 및 처리 김경염( 세종대) The basic principles of measuring and extracting informations on the human subcutaneous fat layer, pulse wave, and stress using near-infrared light sources are presented. Theoretical and preliminary experimental results will be discussed in detail in the presentation. 학술발표 F3D 도래세미나실 광섬유광원 및 능동소자 II 14:40~16:10 좌장 : 엄태중(APRI) 14:40( 초청논문) F3D-1 한국표준과학연구원의 광섬유 측정표 준현황 김승관, 이동훈, 서호성, 박승남(KRISS) We present our current status of fiber optics measurement standards in KRISS, including fiber optic power responsivity, optical fiber length, attenuation, return loss, chromatic dispersion, polarization dependent loss, polarization mode dispersion, optical fiber nonlinearities, and so on. We review the standard measurement methods with principles, setups, and uncertainties of them. 15:10( 초청논문) F3D-2 초연속 스펙트럼에서 좁은선폭의 빛의 세기 조절 Dong-Il Yeom, Jeremy A. Bolger, Dane R. Austin, Boris T. Kuhlmey, C. Martijn de Sterke, Benjamin J. Eggleton(University of Sydney, Australia) We demonstrate tunable spectral enhancement of the supercontinuum generated in a microstructured fiber by using a fiber long-period grating. The long-period grating leads to phase distortion and loss, which, with subsequent high-intensity propagation in uniform fiber, evolves into an enhancement around the resonant wavelength of the grating. Wavelength tunability is achieved by varying the temperature or the ambient refractive index. 15:40( 초청논문) F3D-3 고출력 광원을 위한 hollow optical fiber 김재선( 삼성전자) Depressed clad hollow optical fibers were proposed for cladding-pumped high-power fiber lasers. Nd3+-doped DCHOF and Yb3+-doped DCHOF generated 3.3W at 929nm with 41% slope efficiency and 3.1W at 980nm with 34% slope efficiency with respect to the launched pump power respectively. The beam qualities were diffraction-limited. In the case of Yb3+-doped DCHOF, the power was scaled up to 7.5W with 49% slope efficiency with respect to the launched pump power. 도두세미나실 POSTER SESSION II 10:30~12:00 FP-1 유사 주기구조 광결정 분산 보상 광섬유 김소은, 기철식, 이종민(APRI, GIST) We proposed a photonic crystal fiber based on a quasi-periodic arrangement of air holes for chromatic dispersion compensation. The proposed fiber was a two-concentric core structure obtained by introducing three different sizes of air holes in the cladding The dispersion characteristics of the fiber are theoretically investigated by using the semi-vectorial beam propagation method. The influence of the core structures on the dispersion characteristics are reasonably analyzed by using the effective index model. The quasi-periodic photonic crystal exhibits very high negative dispersion of -3400 ps/(km.nm) at 1550nm. FP-2 KRISS에서 NPL CD와 NIST PMD CRM 에대한측정불확도비교및분석 이성헌, 김용평( 경희대), 유한영, 서호성(KRISS) We demonstrate uncertainty comparison and analysis of NPL chromatic dispersion(CD) and NIST polarization mode dispersion(PMD) CRM in the KRISS. The uncertainty of each quantity was evaluated as the combined standard uncertainty multiplied by a coverage factor k=2. The measurement uncertainty was a good agreement between CD &PMD CRM and PDLA system of KRISS. FP-3 Cr 4+ :YAG 레이저의 초 광대역 스펙트럼 을 이용한 광통신 파장 영역의 표준 가스의 흡 수스펙트럼 측정 이종민( 충남대), 유한영(KRISS), 전민용( 충남 대), 서호성(KRISS) We developed a passively mode-locked infrared Cr 4+ :YAG femtosecond laser with stable operation in room temperature. The supercontinuum could be generated by nonlinear effect of the photonic crystal fiber of 20 m length with a pulse of mode-locked Cr 4+ :YAG laser. Finally, we measured absorbtion spectra of optical communication reference gases using the supercotinuum of Cr 4+ :YAG laser. 22
5월 18 일 ( 금) FP-4 편광유지 side-hole 광섬유를 이용한 Sagnac loop 간섭계의 온도 특성 문대승, 김복현, Aoxiang Lin, Guoyong Sun, 한원택, 정영주(GIST), 한영근( 한양대) The temperature sensitivity of dB/dT of different types of PMFs with side holes was measured using Sagnac loop interferometer. The thermal expansion coefficient can be varied by controlling the amount of Ge-doped in the core region. Using this method, dB/dT could be made higher than that of standard PMFs (~10-8/ o C) or comparable to that of standard PCFs (~10-9/ o C). FP-5 타원형 코어 광섬유와 사냑 루프를 이용 한 파장 변환 다파장 광섬유 레이저 문대승, 김복현, Guoyong Sun, 김봉균, 김성 호, 한원택, 정영주(GIST), 한영근( 한양대) We propose and experimentally demonstrate a tunable multi-wavelength SOA fiber laser based on the Sagnac loop mirror using two types of elliptical core side-hole fiber. We could obtain 18 discrete channels with SNR over 30 dB and channel spacing of 0.8 nm. FP-6 상용화된 아크 방전 장치를 이용해 제작 된 광자 결정 광섬유 장주기 격자와 전광섬유 간섭계 최해룡, 김명진, 김석한, 이병하(GIST) We present long period fiber grating imprinted in a pure silica PCF by using commercial arc-discharging system. And, all-fiber interferometer that is implemented by combining one point air-hole collapsing and long period fiber grating is proposed. As a potential application of all fiber interferometer, strain sensing is experimentally demonstrated. FP-7 잡아 늘린 chalcogenide 광섬유에서 나 타나는 향상된 Kerr 비선형 효과 Dong-Il Yeom, Eric C. Mägi, Hong C. Nguyen, Libin Fu, Michael R. E. Lamont, Benjamin J. Eggleton(University of Sydney, Australia) We demonstrate enhanced Kerr nonlinear effects in tapered As2Se3 chalcogenide fiber. We taper the fiber to sub-wavelength waist diameter of 1.2 μm and observe enhanced nonlinearity of 63,600 /W/km, which is about 40,000 times larger than in standard single-mode fiber due to the 400 times larger n2 and almost 100 times smaller effective mode area. FP-8 광자결정 광섬유의 고차모드 해석 박광노, 장현수, 이경식( 성균관대) We analyze low and high order mode properties of the photonic crystal fiber(PCF) with an improved effective index method (IEIM). The modal properties computed with the IEIM, such as the effective index and mode field intensity of the PCF, are well matched to the mode properties calculated by the LFM. FP-9 광세기기반광섬유Fabry-Perot 스트 레인 센서를 이용한 주파수 영역에서의 진동수 와진폭동시측정 황두선, 황성인, 김성호, 심찬욱, 정영주(GIST) We will describe the intensity based extrinsic Fabry-Perot type optical fiber strain sensor for telemetric sensor system. With this optical sensor we measured the change of transmission intensity due to the vibration. In this paper we will propose the measurement method of oscillation frequency and amplitude using FFT of transmission data. FP-10 FBG 와 LPG Pair 센서를 이용한 광세기 기반 정적/ 동적 변형률 측정 김성호, 문대승, 정영주(GIST) We propose an intensity-based optical sensor for measurement of both static and dynamic strain using a fiber Bragg grating (FBG) and a long-period grating (LPG) pair. In this system, the center-wavelength shift was measured in voltage changes by using a photodetector. The result shows linear relationship between the strain and the measured voltage. We will also show measurement results of 100-Hz dynamic strain sensing. FP-11 DFB-LD 단면의 Anti Reflection Coating 설계및제작 기현철, 양명학, 양학, 김태언, 김효진, 김상택, 김선훈, 김회종(KOPTI) DFB(Distributed Feedback) laser diode has a reflective facet in a both-ends side fundamentally. To prevent internal feedback from both facets for realizing super luminescent diode and reducing the reflectioninduced intensity noise of laser diode, it's key techniques are AR coatings FP-12 측면 연마된 광섬유 침수 센서의 빔 전 파특성 Cherl-Hee Lee, Jae-Won Song( 경북대), Kwang Taek Kim( 호남대), JaeHee Park( 계명 대) Beam propagation analysis of side-polished optical fiber submergence sensor is demonstrated by using FDBPM(Finite difference Beam Propagation Method). The behavior of a fiber-slab coupler used as a submergence sensor is studied using a transparent boundary condition. FP-13 TAP/PD/ISOLATOR 하이브리드 모듈 의 광학설계 및 분석 김종혁, 윤현재( 광주대) We have design and analyse optical paths in the TAP/PD/ISOLATOR Hybrid Module using CODE V. The tolerance and the displacement of each component have been investigated, and the locations of the output power and focal points have been determined with the displacements of GRIN lens, isolator and TAP filter. FP-14 Chalcogen 화합물을 이용한 나노 Photo thin film transistor에 대한연구 김경암(ETRI, 서강대), 조규만( 서강대), 송기 봉(ETRI) We used chalcogenide Ge2Sb2Te5(GST) to fabricate the Photo-Thin Film Transistor of nano size. In order to measure rectifying function in the GST it used the AFM cantilever and it produced. FP-15 레이저 다이오드의 문턱전류 계산과 측 정불확도 최승남, 강현서(ETRI) The threshold current of the laser diode and measurement uncertainty were analyzed. By using the second derivative method and cubic interpolation, test time could be shortened and the measurement uncertainty was lowered due to the improved calculation accuracy. Thus the reliable measurement result could be acquired. FP-16 닥터 블레이드 기법에 의한 광PCB용 도파로 제작 서용곤, 김회경, 윤형도, 임영민(KETI), 정기 영, 차경순( 뉴프렉스) We have adopted casting in combination with the doctor blade technique as a waveguide fabrication method for a low cost mass production. The fabricated waveguide insertion loss is 0.5dB/cm at 850nm wavelength. FP-17 화학가스 검출용 광결정 적외선 필터 설계 한영탁, 최춘기, 오상순(ETRI) We designed a photonic crystal enhanced infrared (IR) filter, which has a narrow bandpass characteristic, for the detection of chemical gas such as CO2. The filter consists of an array of air holes etched into a dielectric and a periodically perforated metallic thin film on the silicon substrate. The transmittance and reflectance for the structures with square and hexagonal lattices were calculated by using the finite-difference time-domain (FDTD) method and we confirmed the filter characteristics of the structures. FP-18 점결함을 이용한 초소형 트리플렉서의 설계 및 분석 박대서, 오범환, 박세근, 이일항, 이승걸( 인하대) In this work, we proposed a compact 1.31/1.49/1.55um triplexer based on the photonic crystal device with point defects. The proposed device was designed by utilizing the plane wave expansion method and characterized with FDTD method. Optimally designed triplexer showed the extinction ratios of -17.8dB for 1.31um, -14.4dB for 1.49um and -15.9dB for 1.55um, respectively. FP-19 광 부호분할다중접속을 위한 광 결정 그룹 지연 소자 성준호, 최철현, 이민우, 양정수, 이승걸, 이일 항, 오범환( 인하대) We propose and demonstrate a photonic crystal optical group delay device, in which two dimensional photonic crystal line defect waveguide with chirped hole, induces sequential optical group delays for time-spreading /wavelength-hopping optical code division multiple access (O-CDMA). When a short pulse signal with a wide spectrum comes into this device, the guided light is localized at specific position depending on wavelength. This concept is suitable to realize a pulse waveform synthesizer and an en/decoder for time-spreading/wavelength-hopping O- CDMA. We have confirmed that this device 23
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