The Generation And Switch Technique Of Terahertz In A Silicon Waveguide

Since terahertz waves in a special position in the field of macro-and micro-intersection, either on the basis of theoretical research terahertz technology is stillexploring its practical application, and are caused by a wide range of academicconcern, although experts and scholars have made a lot of progress, but there are stillmany unknown areas and bottlenecks to be resolved. This article from the opticalterahertz generation begin to establish a theoretical model silicon waveguidefour-wave mixing, and simulated and analyzed under collinear phase matchingconditions for silicon waveguide using a four-wave mixing to produce terahertz wavesprocess. Then use silicon waveguide cross-phase modulation effects caused by thepolarization phase rotation to achieve terahertz switches, analog and discussed theimpact of the parameters of this optical switch performance.The main contents of this paper are summarized as follows:1. The nonlinear polarization expressions departure theoretically pushed to thesilicon waveguide coupled wave equations four-wave mixing process is calculatedand simulated in the terahertz collinear phase matching conditions generated byfour-wave mixing wave output power and efficiency, analysis and discussion of themain factors affecting the terahertz output power and efficiency, and come to realizethe possibility of tunable terahertz sources.2. from the classical Maxwell equations deduced picosecond pulses in siliconwaveguides transfer equation and consider the silicon waveguide cross-phasemodulation and self-phase modulation coupled wave equations, and the derivation ofthe cross-phase modulation and self-phase modulation Nonlinear optical signal thephase shift difference formula, we have discussed the last single mode limitations ofthe silicon waveguide ridge.3. based on the third chapter derived coupled wave equations, presented atheoretical study of all-optical tunable terahertz optical switch, the introduction of theuse of non-linear cross-phase modulation induced phase shift caused by the differenceof the signal light nonlinear polarization rotation to design terahertz all-optical switch,to achieve effective control of light7.69THz-10THz of this optical switch can reach the highest switching efficiency of83%, the paper discusses the waveguide lengthand pump power on switching performance, and the effect of the pump light powerand the nonlinear phase shift difference Δφ terahertz output signal, our results alsoshow that the nonlinear phase shift difference Δφ is inversely proportional to thewavelength of the input terahertz signals.