基于液晶/银纳米粒子混合物作为可调不定介质的超薄光开关
Ultrathin optical switch based on a liquid crystal/silver nanoparticles mixture as a tunable indefinite medium
摘要：
我们预测，液晶/银纳米粒子的混合物可以被设计成，在一个频率范围内，其有效的普通和非常的折射率具有不同的符号的实部。我们利用这一结果来设计一个纳米光子器件，通过在两个二氧化硅层之间放置几百纳米厚的混合物来获得。通过诉诸全波模拟，我们表明，通过改变外部施加的电场的方向，该设备可以被用作光调制器，因为它的transmandrel可以在0.02和0.4之间切换，在波长接近的频率范围内的介质是不确定的。该装置的功能性在物理上源于这样的事实，即表征不确定介质内的非常波的双曲线的取向遵循所施加的电场方向，因此，如果双曲线渐近线几乎垂直于平板，则可以在介质内实现倏逝波和均匀传播波之间的完全切换。
英文摘要：
We predict that a liquid crystal/silver nanoparticles mixture can be designed so that, in a frequency range, its effective ordinary and extraordinary permittivities have real parts of different signs. We exploit this result to design a nano-photonic device obtained by sandwiching a few hundred nanometer thick slab of the proposed mixture between two silica layers. By resorting to full-wave simulations, we show that, by varying the direction of an externally applied electric field, the device can be used as an optical modulator since its transmissivity can be switched between 0.02 and 0.4 at a wavelength close to the frequency range where the medium is indefinite. The device functionality physically stems from the fact the orientation of the hyperbola characterizing extraordinary waves within the indefinite medium follows the applied electric field direction and therefore, if the hyperbola asymptote is nearly normal to the slab, full switch between evanescent and homogeneous propagating waves can be achieved within the medium.
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