Abstract:
기존 광대역 테라헤르츠 분광시스템의 핵심부품인 PCA 및 포토믹서의 현존하는 제한적인 요소를 근본적으로 해결한 포토믹서 및 그의 제조방법을 제시한다. 제시된 포토믹서는 기판의 상면에 형성되되 광이 입사되는 영역에 형성된 활성층, 및 기판의 상면에 형성되되 광이 입사되는 영역을 제외한 나머지 영역에 형성된 열전도층을 포함한다. 활성층은 메사형 단면을 갖도록 형성되고, 열전도층은 광이 입사되는 영역을 제외한 영역에 MOCVD법으로 재성장되어 평탄화된 표면을 갖게 된다.
Abstract:
Disclosed is a photomixer which basically solves a present lamination element in a photomixer and a PCA which is a core part of an existing broadband tera hertz spectroscopy. The photomixer includes an active layer which is formed on the upper surface of a substrate and formed in one region where light enters, and a thermal conductive layer which is formed on the upper surface of a substrate and is formed in the other region. The active layer has a mesa-type cross section. The thermal conductive layer has a flat surface by regrowing the other region with a MOCVD method.
Abstract:
PURPOSE: A horn antenna is provided to implement a terahertz transmitting/receiving module with high transfer efficiency at a low cost by using the characteristic of silicon of being etched anisotropically. CONSTITUTION: A horn antenna includes a substrate (100) and a silicone antenna unit (200). On the substrate, a feeding unit for feeding a terahertz band signal and a terahertz transmitting/receiving module for transmitting and receiving a terahertz band signal are placed. The silicone antenna unit contacts the substrate. As the surface contacting the substrate is etched, a horn cavity (225) one side of which is open to the outside in a direction horizontal to the contact surface is formed. The horn cavity is combined to the substrate and includes a radiation opening part one side of which is open to the outside in a direction horizontal to the contact surface.
Abstract:
PURPOSE: A terahertz continuous wave system and a 3D image acquisition method thereof are provided to deposit a photoconductor thin film directly on a silicon substrate and to mount a meta-material lens on the silicon substrate, thereby simplifying the entire manufacturing process and removing the factors of generating errors. CONSTITUTION: A terahertz continuous wave system(10) comprises a terahertz wave generator(100), a nondestructive detector(200), and a 3D image processor(600). The terahertz wave generator generates terahertz continuous waves. The nondestructive detector radiates the generated terahertz continuous waves to a specimen and regulates the radiated terahertz continuous waves while moving the specimen two-dimensionally at a predetermined interval, thereby measuring a change in the terahertz continuous waves. The 3D image processor acquires 3D images using 2D images corresponding to the measured terahertz continuous waves.
Abstract:
PURPOSE: A method for measurement of device characteristics using a photonic mixing continuous wave system and a terahertz output measuring device using the same are provided to measure the frequency characteristics of a terahertz photomixer antenna device and the frequency characteristics of a terahertz output measuring device. CONSTITUTION: A matching condition for the output impedance of a photomixer and the input impedance of an antenna is added to the output of a photomixer of a transmitter and the output of the photomixer and the antenna of the transmitter are calculated(S10). The output of the antenna of a receiver is calculated based on the output of the photomixer and the antenna of the transmitter(S30). The antenna output of the transmitter and the antenna output of the receiver are outputted to analyze the device characteristics of the photomixer and the antenna(S40).
Abstract:
The present invention relates to a beating signal monitoring module, and a terahertz wave generator and an optical signal monitoring device including the same. The beating signal monitoring module according to the present invention comprises: a non-linear unit for generating an optical signal, including four wave mixing (FWM) light, in response to a beating signal generated based on first and second light; a filter unit for separating the FWM light from the optical signal and outputting the separated FWM light; and a monitoring unit for monitoring the beating signal by using the separated FWM light. According to the beating signal monitoring module, and the terahertz wave generator and the optical signal monitoring device including the same of the present invention, the beating signal generated by using two lasers can be efficiently monitored by using the FWM signal.
Abstract:
The present invention relates to a terahertz wave generating module and a terahertz wave detecting device including the same. The terahertz wave generating module according to the present invention comprises: a bidirectional light source which provides a first dual-mode beam in a first direction and a second dual-mode beam in a second direction; a forward lens unit which focuses the first dual-mode beam; a photomixer unit which converts the first dual-mode beam focused by the forward lens unit into a terahertz wave, and outputs the converted terahertz wave; a backward lens unit which focuses the second dual-mode beam; and a light output unit which uses the second dual-mode beam focused by the backward lens unit as a light signal, wherein the bidirectional light source, the forward lens unit, the photomixer unit, the backward lens unit, and the light output unit are integrated in a housing. The terahertz wave generating module and the terahertz wave detecting device including the same according to the present invention may have a small size and efficiently monitor generated terahertz waves.