Dielectric Antenna Light Modulation via Refractive Index Tuning
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Solution Overview
Problem
Existing optical modulators have slow operating response times, limiting their effectiveness in controlling light properties such as transmission, reflection, polarization, phase, and intensity.
Innovation Solution
A light modulation device utilizing a dielectric antenna with a refractive-index-variable layer, where the refractive index changes in response to an electric signal, combined with conductive layers to form an electric field, enabling efficient modulation of light intensity and phase with reduced optical loss and a wide control range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional optical modulators use anisotropic liquid crystals or MEMS structures, then light modulation function is achieved, but operating response time becomes slow (more than several μs)
Solution Approach 1:
The patent replaces mechanical MEMS structures and liquid crystal molecular reorientation with a dielectric antenna system that uses electromagnetic field interaction and Mie resonance. The dielectric antenna (e.g., silicon nanodisk) interacts with light through resonant modes that can be rapidly tuned by changing the refractive index of the surrounding medium via voltage control, eliminating slow mechanical or molecular response mechanisms.
Solution Approach 2:
The patent changes the refractive index parameter of the medium surrounding the dielectric antenna by applying voltage to the conductive layers. This parameter change rapidly tunes the resonance conditions of the dielectric antenna, enabling fast light modulation response times much faster than traditional liquid crystal or MEMS approaches.
2Productivity
If dielectric antenna with width ≤ λ/2 is used, then light modulation efficiency is improved, but device area is reduced
Solution Approach 1:
The patent concentrates light modulation functionality into a localized dielectric antenna structure with dimensions ≤ λ/2. This sub-wavelength structure creates strong localized electromagnetic fields and resonant modes that efficiently interact with incident light, achieving high modulation efficiency in a compact footprint rather than requiring large-area traditional modulator structures.
3Speed
If refractive-index-variable layer is introduced for fast modulation, then operating speed is improved, but device structure becomes more complex
Solution Approach 1:
The patent creates a composite structure combining a dielectric antenna (e.g., silicon), a refractive-index-variable layer (e.g., liquid crystal or polymer), and conductive layers (e.g., ITO, aluminum). This composite material system leverages the resonant properties of the dielectric antenna and the rapid refractive index tunability of the variable layer, achieving fast modulation while maintaining a relatively simple integrated structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves fast and efficient light modulation with low loss and a wide control range, outperforming traditional optical modulators by leveraging Mie resonance and dielectric antenna structures for improved performance.
Implementation Method 1
The dielectric antenna may have a shape with dimensions of a sub-wavelength and a high dielectric constant... utilizing nano-antennas that utilize the surface plasmon resonance (SPR) phenomenon... Mie resonance structures having controllable resonance characteristics
Implementation Method 2
a refractive-index-variable layer which faces the nano-antenna layer and comprises a material having a refractive index that changes according to a signal
Data Source
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AI summary
A light modulation device includes a dielectric antenna and a refractive-index-variable layer which faces the dielectric antenna and comprises a material having a refractive index that changes according to a signal. A light may be modulated, since resonance characteristics of the dielectric antenna are controlled according to a refractive-index change of the refractive-index-variable layer.