Chen Yi-Fan, Fischer Peer, Wise Frank W
Department of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
Phys Rev Lett. 2005 Aug 5;95(6):067402. doi: 10.1103/PhysRevLett.95.067402. Epub 2005 Aug 1.
There is significant motivation to develop media with negative refractive indices at optical frequencies, but efforts in this direction are hampered by the weakness of the magnetic response at such frequencies. We show theoretically that a nonmagnetic medium with two atomic or molecular constituents can exhibit a negative refractive index. A negative index is possible even when the real parts of both the permittivity and permeability are positive. This surprising result provides a route to isotropic negative-index media at optical frequencies.
开发具有光学频率负折射率的介质具有重大意义，但在此方向上的努力因该频率下磁响应较弱而受阻。我们从理论上表明，一种具有两种原子或分子成分的非磁性介质可以呈现负折射率。即使介电常数和磁导率的实部均为正值时，负折射率也是可能的。这一惊人结果为实现光学频率下的各向同性负折射率介质提供了一条途径。
