Nanostructure Optical Modulator for High-Speed Response
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Solution Overview
Problem
Existing optical modulators have slow response times due to their driving methods, limiting their ability to efficiently control light characteristics such as transmission, reflection, polarization, phase, and intensity, particularly in applications requiring high-speed modulation.
Innovation Solution
An optical modulator utilizing nanostructures with variable refractive indices, surrounded by a lower refractive index insulation layer and controlled by a refractive index changer, which applies voltage to change the refractive indices of the nanostructures, enabling rapid modulation of light characteristics through surface plasmon resonance phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional optical modulators (liquid crystal, MEMS) are used, then optical modulation function is achieved, but response time is slow (order greater than several microseconds)
Solution Approach 1:
The patent changes the physical state and optical parameters of the modulator by introducing a nanostructure with variable refractive index. The refractive index can be dynamically adjusted by applying voltage, enabling rapid modulation of light characteristics without the slow mechanical movements of conventional devices. This parameter change approach achieves both high-speed response and maintained modulation efficiency.
Solution Approach 2:
The patent replaces mechanical movement systems (liquid crystal rotation, MEMS physical displacement) with an electro-optical system. By using a voltage-controlled refractive index changer, the modulation is achieved through electrical field effects rather than mechanical motion, eliminating the inherent speed limitations of mechanical systems while maintaining optical control capability.
2Speed
If nanostructure with variable refractive index is used, then response time is improved, but device complexity increases
Solution Approach 1:
The patent segments the modulator into distinct functional layers: a base layer, a nanostructure layer with variable refractive index, and an upper layer. This segmentation allows each component to perform its specific function independently, simplifying the overall design and fabrication process while enabling high-speed response through the specialized nanostructure layer.
Solution Approach 2:
The nanostructure layer serves multiple functions simultaneously: it provides the variable refractive index for rapid modulation, maintains structural integrity, and enables optical control. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving improved response time.
3Use of energy by moving object
If conventional optical modulators are used, then optical control is achieved, but power consumption is high
Solution Approach 1:
The patent replaces power-intensive mechanical systems with an electro-optical system that consumes less energy. The voltage-controlled refractive index change requires significantly less power compared to the continuous electrical signals needed to maintain liquid crystal orientations or drive MEMS actuators, achieving both low power consumption and high modulation speed.
Solution Approach 2:
The patent utilizes dynamic parameter changes in the refractive index that can be rapidly switched with low energy input. By applying voltage pulses to change the refractive index state, the system achieves high-speed modulation without the continuous power consumption required by conventional devices, improving both productivity and energy efficiency.
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 optical modulator achieves high-resolution and high-efficiency control of light characteristics with significantly improved response times, allowing for faster modulation and reduced power consumption, making it suitable for applications like high-speed data transmission and imaging.
Implementation Method 1
Recently, efforts have been made to utilize, in optical devices, a nanostructure which uses a surface plasmon resonance phenomenon occurring at a boundary between a metal layer and a dielectric layer.
Implementation Method 2
a refractive index changer configured to change the refractive indexes of the plurality of nanostructures
Data Source
AI summary
An optical modulator includes a plurality of nanostructures, each nanostructure of the plurality of nanostructures having a refractive index that is variable; a first insulation layer having a refractive index that is less than the individual refractive indexes of the plurality of nanostructures and surrounding the plurality of nanostructures; and a refractive index changer configured to change the refractive indexes of the plurality of nanostructures.