作者dhtsai (tsai dzeng-han)
看板Physics
标题Re: [请益] 负折射率
时间Tue Nov 24 11:32:48 2009
in staic electrical field
the electric susceptibility is definied to be proportitional to the outside field.
but in " oscillated outside electric field" , if the dipole in the material
,induced by the oscillated outside elecric fied, is "delay in time phase".
the dipole shows "reverse proportional" to the outside electric field.
a funny picture is ,
在人民大会堂 大家鼓掌的节奏都一致 可是江泽民的节奏就是慢半拍
集体鼓掌可视为外加电场 江泽民的手可视为待测材料
外加电场往左 他的偶极偏偏往右
关键在"慢半拍"
※ 引述《eagle0149 (生活者)》之铭言:
: 折射率是光在真空的速度与光在介质中的速度之比值
: 依照此定义,为何有负折射率的物质
: 若折射率为负的,那不代表光在物质中的速度为负的?
: 负折射率物质又有何应用呢? 感谢解惑
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