Terahertz wave photochopper based on silicon-based vanadium oxide thin film and using method thereof
A technology of vanadium oxide film and chopper, which is applied in the field of terahertz chopper, can solve the problems of mechanical choppers such as hard to compress volume, hard work, and limited speed, and achieve the advantages of easy miniaturization, fast modulation speed and stable mode Effect
Inactive Publication Date: 2012-07-11
TIANJIN UNIV
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Problems solved by technology
This kind of mechanical chopper has two problems that are difficult to solve: (1) Because mechanical devices such as choppers and motors cannot be integrated, it is difficult to compress the volume of the mechanical chopper to a small size; (2) the speed of mechanical rotation Limited, typically a few kilohertz, difficult to work where high-speed chopping is required
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specific Embodiment approach
[0014] The specific implementation of the terahertz optical chopper based on silicon-based vanadium oxide thin film is as follows:
[0015] First, a silicon-based vanadium oxide thin film is prepared. Choose high-resistance silicon wafers with single-sided polishing and crystal orientation in the direction of , and the resistivity p>1000Ω / cm 2 , thickness 600 microns. The formation of vanadium oxide film is at the ratio of argon to oxygen Ar:O 2 =48:0.8 (sccm), pressure 2Pa, magnetron sputtering at room temperature for 2 hours, the film thickness is 620nm.
[0016] The prepared silicon-based vanadium oxide thin film 2 was placed 5 mm in front of the terahertz focus of the terahertz time-domain spectroscopy system. The laser light emitted by the laser diode 4 is irradiated onto the surface of the silicon-based vanadium oxide thin film 2 through a lens 3 with a focal length of 50 cm. The black shading plate 1 blocks the reflected laser light to avoid damage to human eyes. B...
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Abstract
The invention relates to a terahertz wave photochopper based on a silicon-based vanadium oxide thin film and using method thereof, belonging to the technical field of terahertz chopping. The chopper comprises the silicon-based vanadium oxide thin film, a laser diode, a focusing lens, a driving power of the laser diode, a square wave signal generator and a reference signal output terminal. The chopping process of the chopper comprises the following steps of: putting the silicon-based vanadium oxide thin film in the terahertz beam; radiating the silicon-based vanadium oxide thin film by the laser diode; controlling a faculae area of the radiating region by the focusing lens; controlling the laser square wave pulse output by the laser diode by the square wave signal generator, wherein the output frequency is adjustable between 100 Hz and 3 KHz; the transmission rate of the silicon-based vanadium oxide thin film is periodically changed under the action of the laser square wave signal so as to periodically control on-off of the terahertz wave and reach the purpose of chopping the terahertz wave. The terahertz wave photochopper is stable for chopping, low in cost, small in volume, convenient to integrate and fast in modulation speed.
Description
technical field [0001] The invention relates to a terahertz optical chopper based on a silicon-based vanadium oxide thin film and a use method thereof, belonging to the technical field of terahertz chopper. Background technique [0002] The chopper is an essential part of the lock-in amplifier technology. The chopper realizes the modulation of the signal by controlling the on-off of the optical signal, and the combination with the lock-in amplifier can realize the detection of the weak signal. Optical choppers have important applications in the fields of weak signal measurement such as fiber amplifier characteristic measurement, fiber grating sensing, and terahertz time-domain spectrum analysis. [0003] In the terahertz time-domain spectroscopy system, the most widely used is the mechanical chopper. The mechanical chopper consists of four parts: mechanical chopper, mechanical frame, optocoupler frequency feedback and speed control electronics system. The mechanical choppe...
Claims
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IPC IPC(8): G02F1/01
Inventor 栗岩锋邢岐荣王昌雷田震柴路胡明陈涛
Owner TIANJIN UNIV