Bloch Oscillation Based On Black Phosphorus Material

Black phosphorus has many excellent physical properties:its thermodynamic properties are stable;it can support surface plasmons;direct band gap semiconductor materials;it can realize the room temperature Hall effect;and has a high carrier mobility.At the same time,black phosphorous materials show good anisotropy and have strong tunable optical characteristics,so black phosphorous materials have a wide range of application prospects in the field of optoelectronics,and have become a popular research direction in recent years.In this paper,the physical model of the black phosphorus structure is established,its characteristic parameters are derived,combined with the anisotropic dispersion relationship of the black phosphorus,the transmission matrix method is used,and the conductivity of the black phosphorus under different carrier concentration conditions is calculated using Matlab programming.Rate,dielectric constant and reflection coefficient.At the same time,a one-dimensional quasi-periodic composite structure of black phosphorus-silica was proposed,and its transmission characteristics from visible light to infrared band were calculated.In addition,the key simulation calculation of the transmission pattern and Bloch oscillation characteristics of the black phosphorus-silica composite structure at different frequencies,carrier concentration,and black phosphorus thickness.The main findings are:(1)When the Gaussian beam enters the composite structure from the vacuum at an angle of 900,the black phosphorus is combined with silica in the AC direction,and the frequency is 525 THz to 573 THz without introducing a thickness gradient ? In the range of 0,the transmittance is zero,forming a photonic band gap,and there is no back-and-forth movement in the visible light frequency range,indicating that the light wave does not have Wanniers Stark ladders in this composite structure,but in other low frequency or high frequency There is a partial energy loss,so there is a lower transmission band.When the thickness gradient 8 is 0.01,the peaks are formed at 509THz,557THz and 620THz,and Wanniers Stark ladders are generated.(2)When a Gaussian beam with a center frequency of 557 THz is transmitted into the black phosphorus-silicon dioxide structure,the simulation produces a similarly formed sinusoidal waveform,and its amplitude is somewhat reduced,and the electric field strength is very obvious,that is,Bloch oscillation,indicating black Phosphorus-silica combination is a very good and feasible structure.(3)In the field of visible light,the propagation properties of the one-dimensional quasi-periodic composite structure can be extended to the infrared band,especially the pulse width frequency selectivity.In this way,a higher wavelength band can be applied to materials with alternately arranged thickness gradients to obtain transmission waveforms in its range,which can greatly enrich the pulse selectivity.The propagation of electromagnetic waves in one-dimensional quasi-periodic composite structures and the results of Bloch oscillations based on black phosphorous materials will have good theoretical guidance for the development of light wave transmission in the periodic alternating distribution structure,the development of the infrared band,and the production of related optoelectronic devices.