Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.5.215
Jeeyoung Lee, Myeongkyu Lee
본 논문에서는 레이저 dewetting에 의해 형성된 은 나노입자들의 국소 표면플라즈몬 공명이 감응형 $TiO_2$ 태양전지의 전류밀도 및 효율 향상에 유용하게 이용될 수 있음을 보여준다. 전도성 유리기판 위에 증착된 은 박막을 펄스 레이저 조사에 의해 나노입자로 변환시킨 후 이 기판을 사용하여 감응형 $TiO_2$ 태양...
{"title":"Localized Surface-Plasmon Resonance of Ag Nanoparticles Produced by Laser Dewetting to Improve the Performance of a Sensitized TiO 2 Solar Cell","authors":"Jeeyoung Lee, Myeongkyu Lee","doi":"10.3807/KJOP.2018.29.5.215","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.5.215","url":null,"abstract":"본 논문에서는 레이저 dewetting에 의해 형성된 은 나노입자들의 국소 표면플라즈몬 공명이 감응형 $TiO_2$ 태양전지의 전류밀도 및 효율 향상에 유용하게 이용될 수 있음을 보여준다. 전도성 유리기판 위에 증착된 은 박막을 펄스 레이저 조사에 의해 나노입자로 변환시킨 후 이 기판을 사용하여 감응형 $TiO_2$ 태양...","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"215-219"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.6.247
J. Hwang, Taek Jeong, H. Moon
{"title":"Light Amplification in Diode-pumped Cesium Vapor Cell","authors":"J. Hwang, Taek Jeong, H. Moon","doi":"10.3807/KJOP.2018.29.6.247","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.6.247","url":null,"abstract":"","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"247-252"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.5.204
Munhyun Han, Gyudong Choi, H. Seo, B. Mheen
Since LIDAR is advantageous for accurate information acquisition and realization of a high-resolution 3D image based on characteristics that can be precisely measured, it is essential to autonomous navigation systems that require acquisition and judgment of accurate peripheral information without user intervention. Recently, as an autonomous navigation system applying LIDAR has been utilized in human living space, it is necessary to solve the eye-safety problem, and to make reliable judgment through accurate obstacle recognition in various environments. In this paper, we construct a single-shot LIDAR system (SSLs) using a 1550-nm eye-safe light source, and report the analysis method and results of LIDAR signals for various measurement environments, reflective materials, and material angles. We analyze the signals of materials with different reflectance in each measurement environment by using a 5% Al reflector and a building wall located at a distance of 25 m, under indoor, daytime, and nighttime conditions. In addition, signal analysis of the angle change of the material is carried out, considering actual obstacles at various angles. This signal analysis has the merit of possibly confirming the correlation between measurement environment, reflection conditions, and LIDAR signal, by using the SNR to determine the reliability of the received information, and the timing jitter, which is an index of the accuracy of the distance information.
{"title":"Analysis of Eye-safe LIDAR Signal under Various Measurement Environments and Reflection Conditions","authors":"Munhyun Han, Gyudong Choi, H. Seo, B. Mheen","doi":"10.3807/KJOP.2018.29.5.204","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.5.204","url":null,"abstract":"Since LIDAR is advantageous for accurate information acquisition and realization of a high-resolution 3D image based on characteristics that can be precisely measured, it is essential to autonomous navigation systems that require acquisition and judgment of accurate peripheral information without user intervention. Recently, as an autonomous navigation system applying LIDAR has been utilized in human living space, it is necessary to solve the eye-safety problem, and to make reliable judgment through accurate obstacle recognition in various environments. In this paper, we construct a single-shot LIDAR system (SSLs) using a 1550-nm eye-safe light source, and report the analysis method and results of LIDAR signals for various measurement environments, reflective materials, and material angles. We analyze the signals of materials with different reflectance in each measurement environment by using a 5% Al reflector and a building wall located at a distance of 25 m, under indoor, daytime, and nighttime conditions. In addition, signal analysis of the angle change of the material is carried out, considering actual obstacles at various angles. This signal analysis has the merit of possibly confirming the correlation between measurement environment, reflection conditions, and LIDAR signal, by using the SNR to determine the reliability of the received information, and the timing jitter, which is an index of the accuracy of the distance information.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"204-214"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.6.233
H. Park, Dong-Hwa Kang, Michael Kong, Eun-Ji Kim, Yefang Lee, Ye-Ji Jo, M. Jung
불꽃감지기란 불꽃에서 발생하는 특수한 파장을 감지하는 장치로, 화재를 초기에 신속히 탐지하여 인간이 인지 가능하 도록 신호를 발생한다. 불꽃감지기용 테스트램프는 불꽃과 비슷한 파장대의 빛을 방사시키는 휴대용 조명 기구로, 불을 사용할 수 없는 장소에서도 충분히 성능 평가가 가능하다는 장점이 있어 불꽃감지기 성능 확인에 사용된다. 실제 화재에 가까운 환경을 만들기 위해 테스트램프는 높 은 광량의 빛을 평행하게 진행시키는 것이 중요하다. 하지만 중앙 빛을 제어하는 반사경의 위치를 정확하게 고정하는 것 이 어렵다는 단점으로 인해 제작 시 성능이 크게 떨어져 충 분한 기능을 하지 못하는 경우가 많다. 따라서 광학계 내부 에 사용되는 반사경의 형상, 위치 및 제작 공차에 대한 분석 이 필요하다. 본 논문에서는 조사거리 8000 mm, 조사영역 1000 mm × Study of the Reflector Shape of a Test Lamp for a Flame Detector with Little Influence of Error in Optical-system Fabrication
火花感知器是感知火花产生的特殊波长的装置，在初期迅速探测火灾，发出人类可以认知的信号。火花感知器用测试灯是放射与火花相似波长的光的便携式照明器具，具有在不能使用火的场所也可以充分进行性能评价的优点，因此被用于确认火花感知器的性能。为了营造接近火灾的环境，测试灯的高光量的光平行进行非常重要。但是由于很难正确固定控制中央光的反射镜的位置的缺点，在制作时性能大幅下降，不能起到充分的功能的情况较多。因此，有必要对光学学界内部使用的反射镜的形状、位置及制作空差进行分析。本论文调查距离8000毫米，调查区域1000毫米× Study of the Reflector Shape of a Test Lamp for a Flame Detector with Little Influence of Error in Optical-system Fabrication
{"title":"Study of the Reflector Shape of a Test Lamp for a Flame Detector with Little Influence of Error in Optical-system Fabrication","authors":"H. Park, Dong-Hwa Kang, Michael Kong, Eun-Ji Kim, Yefang Lee, Ye-Ji Jo, M. Jung","doi":"10.3807/KJOP.2018.29.6.233","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.6.233","url":null,"abstract":"불꽃감지기란 불꽃에서 발생하는 특수한 파장을 감지하는 장치로, 화재를 초기에 신속히 탐지하여 인간이 인지 가능하 도록 신호를 발생한다. 불꽃감지기용 테스트램프는 불꽃과 비슷한 파장대의 빛을 방사시키는 휴대용 조명 기구로, 불을 사용할 수 없는 장소에서도 충분히 성능 평가가 가능하다는 장점이 있어 불꽃감지기 성능 확인에 사용된다. 실제 화재에 가까운 환경을 만들기 위해 테스트램프는 높 은 광량의 빛을 평행하게 진행시키는 것이 중요하다. 하지만 중앙 빛을 제어하는 반사경의 위치를 정확하게 고정하는 것 이 어렵다는 단점으로 인해 제작 시 성능이 크게 떨어져 충 분한 기능을 하지 못하는 경우가 많다. 따라서 광학계 내부 에 사용되는 반사경의 형상, 위치 및 제작 공차에 대한 분석 이 필요하다. 본 논문에서는 조사거리 8000 mm, 조사영역 1000 mm × Study of the Reflector Shape of a Test Lamp for a Flame Detector with Little Influence of Error in Optical-system Fabrication","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"233-240"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.6.241
Chung Lee, Sung-Moon Kim
In this paper, a low-cost optical temperature sensor is implemented, using a fiber Bragg grating (FBG) as the temperature probe and a low-cost VCSEL with temperature-dependent output wavelength as the light source. To analyze the wavelength of the reflected light from the FBG, an interrogation was applied using a method of referring to the internal temperature according to the output wavelength of the VCSEL. When the temperature of the VCSEL was adjusted from 14 to 52.2°C, the output wavelength varied from 1519.90 to 1524.25 nm. The degree of wavelength tuning according to temperature was 0.114 nm/°C. The variable wavelength repeatability error according to temperature was ±0.003 nm, and the temperature measurement error was ±0.18°C. As a result of measuring the temperatures from 22.3 to 194.2°C, the value of the internal temperature change of the light source according to the applied temperature ΔΤ was 0.146°C/ ΔΤ , the change in reflected wavelength of the temperature probe according to applied temperature ΔΤ was measured at 16.64 pm/°C. and the temperature measurement error of the sensor was ±1°C.
{"title":"Fiber Bragg Grating Temperature Sensor by the Wavelength Tuning Using the Temperature Dependence of VCSEL","authors":"Chung Lee, Sung-Moon Kim","doi":"10.3807/KJOP.2018.29.6.241","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.6.241","url":null,"abstract":"In this paper, a low-cost optical temperature sensor is implemented, using a fiber Bragg grating (FBG) as the temperature probe and a low-cost VCSEL with temperature-dependent output wavelength as the light source. To analyze the wavelength of the reflected light from the FBG, an interrogation was applied using a method of referring to the internal temperature according to the output wavelength of the VCSEL. When the temperature of the VCSEL was adjusted from 14 to 52.2°C, the output wavelength varied from 1519.90 to 1524.25 nm. The degree of wavelength tuning according to temperature was 0.114 nm/°C. The variable wavelength repeatability error according to temperature was ±0.003 nm, and the temperature measurement error was ±0.18°C. As a result of measuring the temperatures from 22.3 to 194.2°C, the value of the internal temperature change of the light source according to the applied temperature ΔΤ was 0.146°C/ ΔΤ , the change in reflected wavelength of the temperature probe according to applied temperature ΔΤ was measured at 16.64 pm/°C. and the temperature measurement error of the sensor was ±1°C.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"241-246"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.3.110
Dohwan Jeong, J. H. Lee, Ho Jeong, C. Ok, Hyun-Woo Park
We have designed a mid-infrared optical system for an airborne electro-optical targeting system. The mid-IR optical system is a dual-field-of-view (FOV) optics for an airborne electro-optical targeting system. The optics consists of a beam-reducer, a zoom lens group, a relay lens group, a cold stop conjugation optics, and an IR detector. The IR detector is an f/5.3 cooled detector with a resolution of 1280 × 1024 square pixels, with a pixel size of 15 × 15 μm. The optics provides two stepwise FOVs (1.50° × 1.20° and 5.40° × 4.32°) by the insertion of two lenses into the zoom lens group. The IR optical system was designed in such a way that the working f-number (f/5.3) of the cold stop internally provided by the IR detector is maintained over the entire FOV when changing the zoom. We performed two analyses to investigate thermal effects on the image quality: athermalization analysis and Narcissus analysis. Athermalization analysis investigated the image focus shift and residual high-order wavefront aberrations as the working temperature changes from -55°C to 50°C. We first identified the best compensator for the thermal focus drift, using the Zernike polynomial decomposition method. With the selected compensator, the optics was shown to maintain the on-axis MTF at the Nyquist frequency of the detector over 10%, throughout the temperature range. Narcissus analysis investigated the existence of the thermal ghost images of the cold detector formed by the optics itself, which is quantified by the Narcissus Induced Temperature Difference (NITD). The reported design was shown to have an NITD of less than 1.5°C.
{"title":"Athermalization and Narcissus Analysis of Mid-IR Dual-FOV IR Optics","authors":"Dohwan Jeong, J. H. Lee, Ho Jeong, C. Ok, Hyun-Woo Park","doi":"10.3807/KJOP.2018.29.3.110","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.3.110","url":null,"abstract":"We have designed a mid-infrared optical system for an airborne electro-optical targeting system. The mid-IR optical system is a dual-field-of-view (FOV) optics for an airborne electro-optical targeting system. The optics consists of a beam-reducer, a zoom lens group, a relay lens group, a cold stop conjugation optics, and an IR detector. The IR detector is an f/5.3 cooled detector with a resolution of 1280 × 1024 square pixels, with a pixel size of 15 × 15 μm. The optics provides two stepwise FOVs (1.50° × 1.20° and 5.40° × 4.32°) by the insertion of two lenses into the zoom lens group. The IR optical system was designed in such a way that the working f-number (f/5.3) of the cold stop internally provided by the IR detector is maintained over the entire FOV when changing the zoom. We performed two analyses to investigate thermal effects on the image quality: athermalization analysis and Narcissus analysis. Athermalization analysis investigated the image focus shift and residual high-order wavefront aberrations as the working temperature changes from -55°C to 50°C. We first identified the best compensator for the thermal focus drift, using the Zernike polynomial decomposition method. With the selected compensator, the optics was shown to maintain the on-axis MTF at the Nyquist frequency of the detector over 10%, throughout the temperature range. Narcissus analysis investigated the existence of the thermal ghost images of the cold detector formed by the optics itself, which is quantified by the Narcissus Induced Temperature Difference (NITD). The reported design was shown to have an NITD of less than 1.5°C.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"110-118"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70159611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.6.275
Yong Ho Lee, Y. Do
In this study we propose a hybrid color-filter design method in which a nanohole array and a nanodisk array are separated by nanopillars of the material AZ 1500. We propose a design method for an RGB color filter, using the tendency of transmitted light according to each design variable. Especially we analyzed the intensity distribution of the electric field in the cross section, and set the height of the nanopillars so that the local surface-plasmon resonances generated in the two different arrays do not affect each other. The optical characteristics of the optimized color filter are as follows: In the case of the red filter, the ratio of the wavelength band expressing red in the visible broadband is 55.01%, and the maximum transmittance is 41.53%. In the case of the green filter, the ratio of the wavelength band expressing green is 40.20%, and the maximum transmittance is 42.41%. In the case of the blue filter, the ratio of the wavelength band expressing blue is 32.78%, and the maximum transmittance is 30.27%. We expect to improve the characteristics of color filters integrated in industrial devices by this study.
{"title":"Optimal Design Method for a Plasmonic Color Filter by Using Individual Phenomenon in a Plasmonic Hybrid Structure","authors":"Yong Ho Lee, Y. Do","doi":"10.3807/KJOP.2018.29.6.275","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.6.275","url":null,"abstract":"In this study we propose a hybrid color-filter design method in which a nanohole array and a nanodisk array are separated by nanopillars of the material AZ 1500. We propose a design method for an RGB color filter, using the tendency of transmitted light according to each design variable. Especially we analyzed the intensity distribution of the electric field in the cross section, and set the height of the nanopillars so that the local surface-plasmon resonances generated in the two different arrays do not affect each other. The optical characteristics of the optimized color filter are as follows: In the case of the red filter, the ratio of the wavelength band expressing red in the visible broadband is 55.01%, and the maximum transmittance is 41.53%. In the case of the green filter, the ratio of the wavelength band expressing green is 40.20%, and the maximum transmittance is 42.41%. In the case of the blue filter, the ratio of the wavelength band expressing blue is 32.78%, and the maximum transmittance is 30.27%. We expect to improve the characteristics of color filters integrated in industrial devices by this study.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"275-284"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70160057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.3807/KJOP.2018.29.3.99
Daa young Kwon, Yeh-Chan Ahn
Optical coherence elastography (OCE) is based on optical coherence tomography (OCT), which is a noninvasive, high-resolution, cross-sectional imaging technique. In this paper, we have developed dynamic optical coherence elastography to measure elasticity, a mechanical property of tissue, by phase difference. A piezoelectric actuator was used for sinusoidal mechanical loading of samples. Before applying this method to biomaterial, we assessed the feasibility of OCE with samples of sponge, eraser, and sharp lead. Cross-sectional and phase-difference images of the sample were obtained under sinusoidal loading. The strain rate was calculated from the phase-difference information. To obtain the envelope of the phase-difference oscillations along the horizontal direction, Hilbert transformation was performed at each depth. The elevation of the envelope was represented by color mapping, and we could measure the relative elasticity within the sample by comparing the elevations. Finally, there was an advantage when we calculated the shear rate using self-interference in the sample arm, instead of the interference between sample and reference arms.
{"title":"Preliminary Experiment for High-resolution Measurement of Tissue Mechanical Properties Using Dynamic Optical Coherence Elastography","authors":"Daa young Kwon, Yeh-Chan Ahn","doi":"10.3807/KJOP.2018.29.3.99","DOIUrl":"https://doi.org/10.3807/KJOP.2018.29.3.99","url":null,"abstract":"Optical coherence elastography (OCE) is based on optical coherence tomography (OCT), which is a noninvasive, high-resolution, cross-sectional imaging technique. In this paper, we have developed dynamic optical coherence elastography to measure elasticity, a mechanical property of tissue, by phase difference. A piezoelectric actuator was used for sinusoidal mechanical loading of samples. Before applying this method to biomaterial, we assessed the feasibility of OCE with samples of sponge, eraser, and sharp lead. Cross-sectional and phase-difference images of the sample were obtained under sinusoidal loading. The strain rate was calculated from the phase-difference information. To obtain the envelope of the phase-difference oscillations along the horizontal direction, Hilbert transformation was performed at each depth. The elevation of the envelope was represented by color mapping, and we could measure the relative elasticity within the sample by comparing the elevations. Finally, there was an advantage when we calculated the shear rate using self-interference in the sample arm, instead of the interference between sample and reference arms.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"29 1","pages":"99-103"},"PeriodicalIF":0.1,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70159634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-25DOI: 10.3807/KJOP.2017.28.2.059
D. Park, H. Ryu
This paper proposes an asymmetric split-loop resonator with an outer square loop (ASLR-OSL), which can actively control terahertz wave transmission properties while maintaining a high- Q -factor of the asymmetric split-loop resonator (ASLR). An added outer square loop is designed to play the roles of both a metamaterial and a micro-heater, which can control the temperature through a directly applied bias voltage. A vanadium dioxide (VO 2 ) thin film, which exhibits an insulator-metal phase transition with temperature change, is used to control the transmission properties. The proposed ASLR-OSL shows transmission properties similar to those of the ASLR, and they can be successfully controlled by directly applying bias voltage to the outer square loop. Based on these results, an electrically controllable terahertz high- Q metamaterial could be achieved simply by adding a square loop to the outside of a well-known high- Q metamaterial.
{"title":"Electrically Controllable Asymmetric Split-Loop Terahertz Resonator with Outer Square Loop","authors":"D. Park, H. Ryu","doi":"10.3807/KJOP.2017.28.2.059","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.2.059","url":null,"abstract":"This paper proposes an asymmetric split-loop resonator with an outer square loop (ASLR-OSL), which can actively control terahertz wave transmission properties while maintaining a high- Q -factor of the asymmetric split-loop resonator (ASLR). An added outer square loop is designed to play the roles of both a metamaterial and a micro-heater, which can control the temperature through a directly applied bias voltage. A vanadium dioxide (VO 2 ) thin film, which exhibits an insulator-metal phase transition with temperature change, is used to control the transmission properties. The proposed ASLR-OSL shows transmission properties similar to those of the ASLR, and they can be successfully controlled by directly applying bias voltage to the outer square loop. Based on these results, an electrically controllable terahertz high- Q metamaterial could be achieved simply by adding a square loop to the outside of a well-known high- Q metamaterial.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"59-67"},"PeriodicalIF":0.1,"publicationDate":"2017-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46624331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-04-25DOI: 10.3807/KJOP.2017.28.2.075
Seok-Jae Yun, C. Rim
We present a new type of receiver-transmitter optical system that can be adapted to the sensor head of a displacement-measuring interferometer. The interferometer is utilized to control positioning error and repetition accuracy of a wafer, down to the order of 1 nm, in a semiconductor manufacturing process. Currently, according to the tendency of scale-up of wafers, an interferometer is demanded to measure a wider range of displacement. To solve this technical problem, we suggest a new type of receiver-transmitter optical system consisting of a GRIN lens-Collimating lens-Afocal lens system, compared to conventional receiver-transmitter using a single collimating lens. By adapting this new technological optical structure, we can improve coupling efficiency up to about 100 times that of a single conventional collimating lens.
{"title":"Design and Analysis of a Receiver-Transmitter Optical System for a Displacement-Measuring Laser Interferometer","authors":"Seok-Jae Yun, C. Rim","doi":"10.3807/KJOP.2017.28.2.075","DOIUrl":"https://doi.org/10.3807/KJOP.2017.28.2.075","url":null,"abstract":"We present a new type of receiver-transmitter optical system that can be adapted to the sensor head of a displacement-measuring interferometer. The interferometer is utilized to control positioning error and repetition accuracy of a wafer, down to the order of 1 nm, in a semiconductor manufacturing process. Currently, according to the tendency of scale-up of wafers, an interferometer is demanded to measure a wider range of displacement. To solve this technical problem, we suggest a new type of receiver-transmitter optical system consisting of a GRIN lens-Collimating lens-Afocal lens system, compared to conventional receiver-transmitter using a single collimating lens. By adapting this new technological optical structure, we can improve coupling efficiency up to about 100 times that of a single conventional collimating lens.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"28 1","pages":"75-82"},"PeriodicalIF":0.1,"publicationDate":"2017-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44580462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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