Polarization-Independent Silicon Metadevices for Efficient Optical Wavefront Control
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- 作者：Katie E. Chong ; Isabelle Staude ; Anthony James ; Jason Dominguez ; Sheng Liu ; Salvatore Campione ; Ganapathi S. Subramania ; Ting S. Luk ; Manuel Decker ; Dragomir N. Neshev ; Igal Brener ; Yuri S. Kivshar
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：August 12, 2015
- 年：2015
- 卷：15
- 期：8
- 页码：5369-5374
- 全文大小：369K
- ISSN：1530-6992
文摘
We experimentally demonstrate a functional silicon metadevice at telecom wavelengths that can efficiently control the wavefront of optical beams by imprinting a spatially varying transmittance phase independent of the polarization of the incident beam. Near-unity transmittance efficiency and close to 0鈥?蟺 phase coverage are enabled by utilizing the localized electric and magnetic Mie-type resonances of low-loss silicon nanoparticles tailored to behave as electromagnetically dual-symmetric scatterers. We apply this concept to realize a metadevice that converts a Gaussian beam into a vortex beam. The required spatial distribution of transmittance phases is achieved by a variation of the lattice spacing as a single geometric control parameter.