Details

Autor(en) / Beteiligte

• Chong, Katie E
• Staude, Isabelle
• James, Anthony
• Dominguez, Jason
• Liu, Sheng
• Campione, Salvatore
• Subramania, Ganapathi S
• Luk, Ting S
• Decker, Manuel
• Neshev, Dragomir N
• Brener, Igal
• Kivshar, Yuri S

Titel

Polarization-Independent Silicon Metadevices for Efficient Optical Wavefront Control

Ist Teil von

• Nano letters, 2015-08, Vol.15 (8), p.5369-5374

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2015

Quelle

MEDLINE

Beschreibungen/Notizen

• 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 0–2π 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.