负折射率二元阶梯透镜的纳米工程研究
Nanoengineering of a Negative-Index Binary-Staircase Lens for the Optics Regime
摘要：
我们表明，一个二进制阶梯光学元件可以被设计成表现出一个有效的负折射率，从而扩大了未来的光电子器件理论上可用的光学特性的范围。实现负折射率透镜的机制是基于利用表面折射率的周期性。通过在InP/InGaAsP平台上设计和纳米制造平凹双阶梯透镜，我们已经在1.55微米处实验证明了这种负折射率凹透镜可以聚焦平面波。对光束在透镜中的传输进行了实验研究，并与三维时域有限差分数值模拟结果进行了比较。
英文摘要：
We show that a binary-staircase optical element can be engineered to exhibit an effective negative index of refraction, thereby expanding the range of optical properties theoretically available for future optoelectronic devices. The mechanism for achieving a negative-index lens is based on exploiting the periodicity of the surface corrugation. By designing and nanofabricating a plano-concave binary-staircase lens in the InP/InGaAsP platform, we have experimentally demonstrated at 1.55 microns that such negative-index concave lenses can focus plane waves. The beam propagation in the lens was studied experimentally and was in excellent agreement with the three-dimensional finite-difference time-domain numerical simulations.
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