Single-Order Transmission Diffraction Gratings based on Dispersion Engineered All-dielectric Metasurfaces

Abstract

A single-order transmission diffraction grating based on dispersion engineered all-dielectric metasurfaces is proposed and its wavelength discriminating properties have been theoretically described and confirmed using numerical simulations. The metasurface is designed using a 2D array of all-dielectric resonators, which emulates a Huygens source configuration to achieve a perfect match to free-space in broad bandwidth. Using a holey dielectric nanodisk structure as the unit cell, the resonant wavelength is tapered across the metasurface to engineer the wavelength dependent spatial phase gradient, to emulate a dispersive prism. Consequently, different wavelengths are steered towards different directions and thus are discriminated on the output image plane. Due to subwavelength periodicities involved, the wavelength discrimination is achieved directly in the zeroth diffraction order of the device, unlike conventional diffraction gratings, thereby providing a high efficiency wavelength discriminating device.

5 pages, 5 figures

References in corpus (5)

• High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces
• Multiwavelength Achromatic Metasurfaces by Dispersive Phase Compensation
• General Metasurface Synthesis Based on Susceptibility Tensors
• Low Contrast Dielectric Metasurface Optics
• Visible-frequency metasurfaces for broadband anomalous reflection and high-efficiency spectrum splitting

Cited by in corpus (2)

• Broadband Huygens' Metasurface Based on Hybrid Resonances
• Measurements of Radiation Pressure owing to the Grating Momentum