Electro-optic metasurface-based free-space modulators

Abstract

Research in optical metasurfaces has explosively grown in recent years, primarily due to their ability of exercising complete control over the transmitted and reflected fields. Application prospects in many emerging...

The electro-optic spatial light modulator of lithium niobate metasurface based on plasmonic quasi-bound states in the continuum

“…Here, the permittivity and electro-optic coefficient vary accordingly when the crystal strain varies with the external applied electric field. 29,30 Based on a measured capacitance of 40.0 pF and assuming a 50 Ω resistive load, an estimate of the cutoff frequency f −3 dB = 1/2πRC was calculated to be about 79.6 MHz. The difference from the measured cutoff frequency was due to the previously mentioned reasons for the increased modulation at larger frequencies.…”

Ultrafast charge and field driven optical modulators and switches

“…[73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] Plasmonics, as a seperate branch of nanophotonics, which employs surface plasmon polaritons (SPPs), i.e., collective oscillations of electrons at metal-dielectric interfaces, enables an unprecedented potential for high-performance devices with high operations bandwidths an significantly reduced device foorprint. [92][93][94][95][96][97][98][99] However, it comes at a cost of increased optical losses due to absorption by the metal. Here, we will discuss fundamental limits in the operation speeds of both, charge and field-driven electro-optic modulators, and show that the limitations in the operation speed of nanophotonic devices is determined by the RC time constant of the circuit the electro-optic device is driven with.…”

High‐Contrast Switching of Light Enabled by Zero Diffraction

“…With the sensitivity being sufficiently large, ultrafast electro‐optic effects may be applied for reaching full spatial control of light. [ 14,15 ] Metasurfaces built from thin subwavelength structures have drawn attention as an advanced tool to control the properties of light. [ 16–18 ]…”

“…With the sensitivity being sufficiently large, ultrafast electro-optic effects may be applied for reaching full spatial control of light. [14,15] Metasurfaces built from thin subwavelength structures have drawn attention as an advanced tool to control the properties of light. [16][17][18] In symmetric waveguide gratings, large sensitivity is reported for odd modes providing a node of minimized interaction with the center grating.…”