Coherent Control Of Vortex Beam In Semiconductor Micro-nano Structure

In recent years,vortex beams carrying orbital angular momentum(OAM)have become a hot topic in the field of optics due to their potential applications in particle manipulation,optical communication,and optical information processing.Common vortex beams,such as Laguerre-Gaussian(LG)beams,Bessel-Gaussian beams,higher-order Bessel beams and perfect vortex beams(PVB),exhibit an annular intensity pattern and a helical phase distribution.Due to the unique optical properties of vortex beams,the spatially dependent light-matter interaction induced by optical vortex in atomic gases has also attracted extensive attention and led to a series of interesting optical phenomena,such as spatially dependent electromagnetically induced transparency and coherent transfer of optical vortices.Compared to the atomic gases,semiconductor quantum wells have become an effective platform for exploring the interaction between matter and light beam with OAM due to their flexible structural design and high nonlinear coefficient.Previous studies mainly focused on the transfer and manipulation of mid-infrared LG beams,while the TC measurement of mid-infrared LG beams and the coherent transfer of PVB based on semiconductor quantum wells have not yet received enough attention.Therefore,this paper is to carry out the studies on the TC measurement of mid-infrared LG beams and the coherent transfer of composite PVBs in semiconductor quantum wells.The main research content of this paper is as follows:1、We propose a scheme to measure the TC of a mid-infrared LG beam by observing the interference pattern of the four-wave mixing field in a four-level asymmetric semiconductor quantum well.The presence of the Fano interference effect can lead to the inherent interference effect,thereby resulting in an interference-type intensity and phase distribution of the generated four-wave mixing(FWM)field.It is found that the intensity distribution and visibility of the interference pattern can be effectively changed via adjusting the intensity and detuning of the control field.Subsequently,the effective measurement of TC of the vortex driving field is achieved via directly detecting the number of spots of the FWM field.With the appropriate control parameters,a maximum detectable TC of 120 can be achieved with a visibility exceeding 0.97.Our scheme may provide a possibility for realizing a mid-infrared OAM detector in a compact solid-state system.2、We propose a scheme for transfer and manipulation of composite POVs via three-wave mixing(TWM)in a three-level asymmetric semiconductor quantum well.The OAM information can be completely transferred from a composite PVB to the generated mixing field via the three-wave mixing effect.It is found that the generated mixing field exhibits a double-ring intensity pattern when the overlap degree is zero.the output intensity of the mixing field and the distortion of the helical phase can be controlled via adjusting the intensity and detuning of the control field.When the overlap degree is 0.3,the intensity,phase,and dark core distribution of the interference-type mixing field can also be controlled via tuning the intensity and detuning of the control field.Our scheme has potential applications in the manipulation of PVB-based multiple particles.