Study On The Optical Properties Of One-Dimensional Photonic Crystal In Uitraviolet Spectrum

Photonic crystal is a new type of artificial crystal material with characteristic of photonic bandgap(PBG) structure , which is artificially composed of two or more dielectrics arranged periodically. It provide a most promising perspective pioneering a photonic information age since the electronic information age originated by semiconductor .Photonic crystals have gradually indicated potential applications in optical fields such as integration of minute photoelectron devices,interconnects for optical circuits,full optical communications and so on,due to photonic band gap and optical localization.Photonic band gap structure of photonic crystals indicates its primary Property , which is the base of design of application. So,the study on photonic band gap structure is an important part of basic research on photonic crystals. Photonic crystals include one dimension(1 D),two dimension(2D)and three dimension(3D)photonic crystals according to the special periodic dimension.At present,the study on one-dimensional and two-dimensional photonic crystal is more than three-dimensional photonic crystal because the analysis and manufacture of three-dimensional photonic crystal is difficult. Although the energy loss of ordinary multi-layer photonic crystal structures is low,the band gap is usually limited,there is also wide-wide angle high anti-band hard. The metal materials compared with this type of photonic crystal, Although the absorption will lead to significant energy loss,metal will be very strong reflective in a wide frequency range and under the direction of any incident. If the metal material and the general dielectric photonic crystal materials get together, it will hopefully get better optical properties. Depending on the frequency requirement of specific applications,photonic crystals have been obtained in infrared,microwave,and millimeter-wave region. For wavelength shorter than infrared,especially in UV region only a few experimental and theoretical systems have recently been demonstrated to exhibit the signature of photonic bandgaps.This is because most materials have high absorption coefficients and unstable dielectric constants under prolonged irradiation with UV light.In this paper, optical properties of one-dimensional photonic crystal composed by MgF2,Ta2O5 and metals are analyzed theoretically, Results show that, one-dimensional photonic crystal posed by MgF2,Ta2O5 and Ag with larger band gap and higher reflectivity compared with other one-dimensional photonic crystal posed by MgF2,Ta2O5 and other metals. The structural parameters of MgF2 and Ta2O5 are optimized respectively. For photonic crystal of MgF2, photonic band gap width is up to 90nn(320nm～410nm) with the parameters d Ag= 37.5nm,2d MgF= 112.5nm,N=4. in the case of normal incidence and its reflection rate is up to 92.26%.For photonic crystal of Ta2O5,photonic band gap width is up to 80nn(330nm～410nm) with the parameters d Ag= 60nm, 2 5d Ta O= 140nm,N=2. in the case of normal incidence and its reflection rate is up to 92.44%.Both structures are one-dimensional photonic crystal with incomplete photonic band gap. Both structures are one-dimensional photonic crystal with incomplete photonic band gap. The contents of these studies have important practical significance on understanding of photonic crystals and photonic crystal applications development.