一维光子晶体带隙结构对不同偏振态的角度和波长响应  

Angular and wavelength selectivity of band gaps of holographic photonic crystals for different polarizations

作　　者：李蓉[1] 任坤[1] 任晓斌[1] 周静[1] 刘大禾[1] 

机构地区：[1]北京师范大学物理系

出　　处：《物理学报》2004年第8期2520-2525,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :198740 0 9;60 2 770 14 )资助的课题~~

摘　　要：用传输矩阵法计算了一维光子晶体带隙结构对不同偏振态入射光的角度和波长响应 .结果表明 ,对P偏振态 ,带隙的宽度明显小于S偏振态 .对于角度响应 ,两种偏振态有相同的变化趋势 ,但变化量不同 .而对于波长响应 ,两种偏振态表现出不同的变化趋势 .引入了“广义布儒斯特角”的概念 .理论分析表明 ,当光以此角射入光子晶体时 ,S偏振态入射光的禁带完全保留 ,而P偏振态入射光的禁带完全消失 ,从而可以在S偏振态入射光的禁带背景中用P偏振态入射光获得受主掺杂模式 .The angular and wavelength selectivities of band gaps of holographic photonic crystals were calculated using transfer matrix method for different polarizations. It showed that the width of the band gaps for P_polarization is narrower than that for S_polarization. About the angular selectivity, the changing trends for different polarizations are the same, but with different degree of variations. About the wavelength selectivity, the changing trends for different polarizations are in an opposite way. A \!general Brewster's angle\' is introduced. The theoretical analysis shows that when a beam incident on a photonic crystal just at the \!general Brewster's angle\', the forbidden band of S_polarization will still exist as it is, while the forbidden band of P_polarization will vanish. Therefore, a \!defect mode\' can be obtained in the forbidden band of S_polarization by illuminating the photonic crystal with P_polarization beam at the !general Brewster's angle'. The experimental results for verifying the theoretical calculations were given.

关 键 词：体积全息图 光子晶体 带隙结构 偏振态 传输矩阵法 波长响应 广义布儒斯特角 

分 类 号：O734[理学—晶体学]