The Detection Of Weak Forece Via Optomechanically Induced Transparency

Cavity optomechanics,which aims to study the quantum properties of mechanical systems and explores the interaction between electromagnetic waves and mechanical motion,Then,using feedback forces such as radiation pressure,one can cool the mechanical mode of interest into the quantum ground state and create non-classical states of mechanical motion,has witnessed rapid advances in recent years,leading to a variety of applications,such as high-bandwidth accelerometer,quantum-limited displacement sensing,optical self-focusing,quantum transducer,and most recently,achieving quantum squeezing of mechanical motion.Another notable example,closely ralated to present study,is the experimental demonstration of optomechanically-induced transparency(OMIT),which provides a new approach for coherent control of light with a solid device,such as delay or advance of light,quantum memory,and precision measurement of tiny objects.The basic mechanism of OMIT is the destructive interference of two absorption channels of the signal photons(i.e.absorbed by the cavity field or the mechanical mode),thereby leading to a transparency window for the signal light in the otherwise strongly absorbed region.This is formally equivalent to that of electromagnetically-induced transparency(EIT)well-known in atomic physics.Further interesting studies on the OMIT include,e.g.,nonlinear OMIT,two-color OMIT,cascaded OMIT,and reversed OMIT in parity-time resonators.On the other hand,with the unprecedented ability of fabricating and characterizing materials on the nanometer scale,research in exploring and harnessing the exotic quantum effect like the Casimir force(CF)has become active in recent years.The CF can become increasingly important in nano-devices as the space separation between the component surfaces is drastically decreased.The high-precision CF measurement was first performed in 1997 by Lamoreaux,and then also by several other groups.The CF-induced noveleffects have been revealed,such as vacuum friction of motion,non-touching bound of nano-particles,nonlinear mechanical oscillations,and giant vacuum force near a transmission line.Practical applications of the CF in e.g.quantum sensing of motion was also presented,highlighting its impacts on future quantum technologies.In the present work,by combining these two research fields,we study the CF effect in a cavity optomechanical system.1.We use typical optomechanical system,mobile mirrors placed outside a movable ball can be outside the platinum Fabry Perot cavity,adjusting the distance between the nanospheres and endoscopic,when nanosphere fixed explore the Casimir force on the optomechanical system electromagnetic induced transparent window effects.The transmission of the probe field is obtained by solving the Heinsenberg-langevin equation and the standard input and output.Through the analysis method to find the change of the effect of Casimir force control light field conversion.Through the contrast of a light driven and non driven light by numerical confirmed only by adjusting the Casimir force strength of photodynamic induced transparency windows can be completely closed or re open.This result indicates the possibility of nano scale quantum switch design.2.We use typical optomechanical system,mobile mirrors placed outside a movable ball can be outside the platinum Fabry Perot cavity,adjusting the distance between the nanospheres and endoscopic,movable in the nanosphere explore the Casimir force on the optomechanical system electromagnetic induced transparent window effects.The transmission of the probe field is obtained by solving the Heinsenberg-langevin equation and the standard input and output.The driving and non driving conditions were compared and analyzed.The splitting and turning of the transparent window with the change of pump power are studied.