Numerical Simulation Of Optical Force On Dispersive Gain Media

Aside from the conventional dispersive gain media which generally include solids,semiconductors,liquids,gases,etc,recent studies have been found that cell fluorescence proteins can also be used as laser dispersive gain media.The high directivity of the laser makes it the best light source to study the radiation pressure,which brings a new opportunity for studying the mechanical effect of the laser exerted on particles.The applications of radiation pressure in laser cooling atoms,optical tweezers,isotope separation,laser cleaning and other applications have made great achievements so as to provide new research areas and directions in the study of materials science,cell biology,diagnostic medical science,chemistry and physics.However,the researches on the optical force of the dispersive gain media,especially the chiral dispersive gain media are still in the initial stage.Firstly,based on the theory of the traditional propagation matrix method,this thesis deduces the calculation formula of the propagation matrix method for common gain media and the calculation formula of the propagation matrix method for chiral gain media.Secondly,the two methods of calculating the optical force produced by the electromagnetic fields are introduced,which are the Maxwell's stress tensor and the Lorentz force respectively.Finally,the calculation formula of the optical force of the ordinary dispersive gain media and the isotropic chiral dispersive gain media are deduced by using the Maxwell stress tensor.After completing the derivation of the theoretical formula,the influence of the imaginary part of the permittivity of the dielectric on the gain of the media is discussed in this thesis.Then,the electromagnetic properties of the ordinary gain stratified media are calculated by the propagation matrix method.After selecting the wavelength range of the light source,the changes of the optical force density on the single-layer and multi-layer ordinary gain media slabs versus the frequency are studied respectively.And these changes are further compared with the same type of variations on the absorption media.Follow on,the influences on the optical force density produced by the gain characteristics of the media,the real and imaginary part of the relative permittivity and the thickness of dispersive gain media are analyzed respectively.Next,the Cole-Cole dispersive medium model is used to simulate the dispersive characteristics of ordinary dispersive gain media.Afterwards,in the situation of vertical incidence of wave,the changes of the optical force density with frequency are studied.At last,at the condition of fixed incident wave frequency,the variations of the optical force density versus the angle are analyzed.In this thesis,the Drude dispersive medium model is also used to simulate the dispersive characteristics of the isotropic chiral dispersive gain media.With the propagation matrix method,the electromagnetic properties of the isotropic media are calculated.In the situation of vertical incidence of wave in the single-layer and multi-layer isotropic chiral dispersive gain media,the changes of the optical force density with frequency are studied.And at the condition of fixed incident wave frequency,the variations of the optical force density versus the angle are analyzed.Among them,the influences on the optical force density produced by the thickness of the single-layer isotropic chiral dispersive gain media are also analyzed.