Abstract:
본 발명은 고온초전도 고주파 수동소자의 저온주파수 특성을 저온장비(Cryogenic Equipment)의 부착없이 액체질소만으로도 측정시스템을 냉각하여 저온주파수 특성의 측정을 할 수 있도록 한 고온초전도 수동소자의 저온고주파 특성 측정용 액체질소 냉각 측정장치(test rixture)에 관한 것으로 LN 2 온도(77K)에서도 고주파 특성을 측정할 수 있도록 절연듀어와 고주파하우징내의 공기를 뽑아내고(진공유지), 퍼지(purge)용으로 헬륨가스를 채워넣을(backfilling)수 있게 벨로즈밸브시스템을 채택함과; 측정주파수 영역은 26.5GHz(K-콘넥터)까지로하되, 주파수 확장은 콘넥터의 교환하면 가능하도록 특수한 유연케이블(flexible cable)을 부착함과; 특수하고 고가인 저온냉동(cryogenic refrigeration)장치없이 액체질소만으로도 고온초전도 고주파 수동소자의 고주파 특정측정이 가능한 테스트픽스춰가 되도록 구성한 것이다.
Abstract:
The cystalline thin film (4) of lanthanum aluminate is prepared by (a) maintaining the temperature of the silicon substrate (1) at 100-400 deg.C, (b) flowing the mixture gas which has the ratio of argon to oxygen, 3:1 by the pressure of 10 mTorr, (c) transporting the atoms of lanthanum aluminate ceramics as a sputtering target, retaining the distance between atoms of 20-50 mm, to the surface of the silicon substrate (1), (d) forming the amorphous lanthanum aluminate thin film (3) on the silicon substrate, (e) elevating the temperature to 900-1200 deg.C by 4 deg.C per min. and soaking for 30 min. - 2 hrs. and cooling to the normal temperature by 0.5-1 deg.C per min., and (f) supplying oxygen into the horizontal tube furnace.
Abstract:
PURPOSE: A terahertz receiver and a receiving method of terahertz signals using the same are provided to have high sensitivity signal-receiving performance by combining terahertz signals arrayed by a photoelectric conversion. CONSTITUTION: A plurality of terahertz wave detectors (111-113) detects terahertz band signals from received signals. A plurality of light signal processers (120,130,140) converts the detected terahertz signals into optical signals. An optical coupler (150) couples the converted optical signals to one optical signal. A photoelectric conversion diode (160) converts the integrated optical signal into an electric signal. An amplifier (170) amplifies the electric signal. [Reference numerals] (111,112,113) Terahertz wave detector; (121,131,141) Light source; (122,132,142) Light modulator; (123,133,143) Light amplifier; (150) Optical coupler; (160) Photoelectric conversion diode; (170) Amplifier; (AA) Received signal
Abstract:
PURPOSE: A waveguide type photomixer is provided to reduce a moving distance of an electron-hole pair and a RC time constant. CONSTITUTION: A waveguide type photomixer(100) includes a substrate(101), a buffer layer(102), a first cladding layer(107), an absorber(110), a second clad layer(108), a contact layer(109), a first electrode unit(103), and a second electrode unit(104). The absorber is formed between the first clad layer and the second clad layer. If the absorber forms a junction area smaller than the first clad layer and the second clad layer, a RC time constant, which determines an operation speed of the photo mixer, becomes smaller and the operation speed of the photo mixer increases.
Abstract:
본 발명은 광전도 안테나에 실리콘 볼렌즈가 일체화된 테라헤르츠파 송수신 모듈 및 그 제조 방법에 관한 것으로, 실리콘 볼렌즈를 광전도 안테나에 일체화시키고, 실리콘 볼렌즈와 일체화된 광전도 안테나에 집속 렌즈를 정렬시켜 하나의 완전하고 독립된 테라헤르츠파 송수신 모듈을 구현함으로써, 간단한 구조에 의해 테라헤르츠파를 안정적으로 발생시키거나 측정할 수 있는 것을 특징으로 한다. 따라서, 본 발명에 따르면 테라헤르츠파 발생 및 측정 시스템의 단순화 및 소형화를 도모할 수 있다. 테라헤르츠파, 광전도 안테나, 실리콘 볼렌즈, 정렬
Abstract:
본 발명의 폴디드 다이폴 안테나는 광전도 기판 상에 구불구불한 형태로 형성된 미앤더 라인(meander line)으로 이루어져 있으며, 상기 미앤더 라인의 수평방향 길이, 라인 간격, 폭 및 라인 개수의 최적화에 의해 종래의 다이폴 안테나 보다 훨씬 높은 수 kΩ의 입력 임피던스를 갖는 것을 특징으로 한다. 따라서, 본 발명의 폴디드 다이폴 안테나를 이용하면 10kΩ 이상의 출력 임피던스를 갖는 포토믹서와의 임피던스 정합 특성이 크게 향상되므로, 테라헤르츠 연속파의 출력을 크게 향상시킬 수 있다. 테라헤르츠 대역 연속파(terahertz continuous wave), 포토믹서(photomixer), 폴디드 다이폴 안테나(folded dipole antenna), 입력 임피던스(input impedance), 출력 임피던스(output impedance), 스트립(strip)
Abstract:
PURPOSE: An integrated antenna device module for generating terahertz continuous waves and a fabrication method thereof are provided to reduce the resolution limit of an optical lens by using an existing optical lens as a metamaterial lens. CONSTITUTION: A photoconductive antenna(10) of an integrated antenna device module for generating terahertz continuous waves comprises a photoconductive thin film pattern(11), a metal electrode(12), and a focusing meta material lens(13) for controlling three-dimensional images of an object using high resolution. A substrate is high resistant silicon or InP(Indium Phosphide). The metal electrode applies a DC bias voltage to the photoconductive thin film pattern. The photoconductive thin film pattern is deposited on a front surface of the substrate. The photoconductive thin film pattern irradiates tera-herts continuous waves according to the incidence of the femto second laser pulse having the pulse time of an ultrashort pulse.
Abstract:
PURPOSE: A device and a method for generating a continuous terahertz wave are provided to suppress an optical carrier by a polarization feature of a light source. CONSTITUTION: An optical carrier providing unit(110) provides two optical carriers of a single wavelength. A light intensity modulating unit(120) receives one from the two optical carriers. The light intensity modulating unit generates a DSBSC(Double Sideband-Suppressed Carrier) signal including a DSB(Double Sideband) signal and a suppressed optical carrier. An extraction unit(130) receives the other one among the two optical carriers. The extraction unit extracts an optical carrier of a single polarization component. An optical coupler couples an optical carrier of a single polarization component with the DSB-SC signal.
Abstract:
PURPOSE: A THz wave Tx/Rx module package and a manufacturing method thereof are provided to simply array a silicon ball lens, a photoconductive antenna and a condensing lens to high precision. CONSTITUTION: A silicon ball lens(230) is arranged in the lower of a substrate. A condensing lens(240) condenses a femtosecond laser pulse. A condensing lens arranging device(250) arranges the condensing lens in the active area central part of the photoconductive antenna. Upper and lower fixing parts(260a,260b) open perpendicular upper and lower part of the active area of the photoconductive antenna. Upper and lower covers(270a,270b) shut the opened area of the upper and lower fixing parts.