Optical spatial differentiation with suspended subwavelength gratings
arXiv:2008.10945 · doi:10.1364/OE.416801
Abstract
We demonstrate first- and second-order spatial differentiation of an optical beam transverse profile using thin suspended subwavelength gratings. Highly reflective one-dimensional gratings are patterned on suspended 200 nm-thick silicon nitride membranes using Electron Beam Lithography and plasma etching. The optical transmission of these gratings, designed for illumination with either TM or TE polarized light, are experimentally measured under normal and oblique incidence and found to be in excellent agreement with the predictions of an analytical coupled-mode model as well as Rigorous Coupled Wave Analysis numerical simulations. High quality first- and second-order spatial differentiation of a Gaussian beam are observed in transmission at oblique and normal incidence, respectively. Such easy-to-fabricate, ultrathin and loss-free optical components may be attractive for beam shaping and optical information processing and computing.
References in corpus (22)
- Strong dispersive coupling of a high finesse cavity to a micromechanical membrane
- Mechanical Resonators for Quantum Optomechanics Experiments at Room Temperature
- A Photonic Crystal Slab Laplace Differentiator
- Strong coupling and long-range collective interactions in optomechanical arrays
- Ultralow-Noise SiN Trampoline Resonators for Sensing and Optomechanics
- Analog computing by Brewster effect
- First-order optical spatial differentiator based on a guided-mode resonant grating
- High-finesse Fabry-Perot cavities with bidimensional SiN photonic-crystal slabs
- Integrated optomechanical arrays of two high reflectivity SiN membranes
- High-reflectivity, high-Q micromechanical membranes via guided resonances for enhanced optomechanical coupling
- Spatial Integration by a Dielectric Slab Waveguide and its Planar Graphene-based Counterpart
- Centimeter-scale suspended photonic crystal mirrors
- Analog Optical Computing by Half-Wavelength Slabs
- Cavity Quantum Electrodynamics with Frequency-Dependent Reflectors
- Mechanically Compliant Grating Reflectors for Optomechanics
- Cavity Mode Frequencies and Strong Optomechanical Coupling in Two-Membrane Cavity Optomechanics
- Optomechanical characterization of silicon nitride membrane arrays
- Suspended photonic crystal membranes in AlGaAs heterostructures for integrated multi-element optomechanics
- Microcavities with suspended subwavelength structured mirrors
- Membrane sandwich squeeze film pressure sensors
- Suspended silicon nitride thin films with enhanced and electrically tunable reflectivity
- Profilometry and stress analysis of suspended nanostructured thin films
Cited by in corpus (9)
- Isotropic Topological Second-Order Spatial Differentiator Operating in Transmission Mode
- Neural network design of multilayer metamaterial for temporal differentiation
- Squeeze film absolute pressure sensors with sub-millipascal sensitivity
- Profilometry and stress analysis of suspended nanostructured thin films
- Narrow-linewidth Fano microcavities with resonant subwavelength grating mirror
- Mechanical investigations of free-standing SiN membranes patterned with one-dimensional photonic crystal structures
- Polarization-independent optical spatial differentiation with a doubly-resonant one-dimensional guided-mode grating
- Highly reflective and high- thin resonant subwavelength gratings
- Collimation and finite-size effects in suspended resonant guided-mode gratings