Optical Modulation Device Double Electrode Phase Control
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Solution Overview
Problem
Conventional optical modulation devices face limitations in controlling the phase and amplitude of light, particularly in achieving a 360° reflection phase change while maintaining constant reflectance, which affects the efficiency and noise levels during beam steering applications.
Innovation Solution
The proposed optical modulation device employs a double electrode structure with independently applied voltages to a nano-antenna, an active layer, and a conductor, utilizing a plasmonic nano-antenna and dielectric layers to modulate light phase and amplitude, enabling up to 360° phase change with minimal reflectance variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single electrode structure is used, then device complexity is reduced, but phase modulation range is limited and cannot achieve 360° reflection phase change
Solution Approach 1:
The single electrode structure is segmented into two independent electrodes: a bottom electrode and a top electrode. Each electrode can be independently controlled with separate voltages, enabling the system to achieve 360° phase modulation range that cannot be obtained with a single electrode. The segmentation allows independent optimization of phase and amplitude control.
Solution Approach 2:
The invention transitions from a one-dimensional voltage control (single electrode) to a two-dimensional voltage control space (bottom electrode voltage and top electrode voltage). This dimensional expansion enables simultaneous independent control of phase and amplitude, achieving complete 360° phase coverage while maintaining constant reflectance.
2Adaptability or versatility
If voltage is applied to change reflection phase, then phase modulation is achieved, but reflectance varies which increases noise and reduces efficiency
Solution Approach 1:
The invention changes the control parameters from single-voltage control to dual-voltage control (bottom electrode voltage Vb and top electrode voltage Va). By independently adjusting these two parameters, the system can maintain constant reflectance while achieving 360° phase modulation, thereby reducing noise and improving beam steering efficiency.
Solution Approach 2:
The dual-electrode structure enables a feedback mechanism where the interaction between bottom and top electrode voltages compensates for reflectance variations. By coordinating the voltage applied to both electrodes, the system maintains constant reflectance while modulating the reflection phase, thus reducing noise during beam steering operations.
3Adaptability or versatility
If nano-antenna structure is used, then optical modulation capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The nano-antenna structure serves multiple functions: it provides optical modulation capability, enables surface plasmon resonance, and facilitates electrical control through electrode coupling. This multi-functionality justifies the increased manufacturing precision requirements, as the same structure achieves both optical performance and electrical controllability.
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
This approach enhances the efficiency of light wave steering by reducing noise and maintaining constant reflectance, allowing for improved optical modulation and beam steering capabilities.
Implementation Method 1
attempts have been made to apply a nano-structure using surface plasmon resonance stimulated by incident light to an optical device
Implementation Method 2
an electro-optical strip is formed in a dielectric layer between two conductor layers to which different voltages are applied in order to selectively activate the electro-optical strip
Data Source
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AI summary
Provided are an optical modulation device and a method of operating the same. The optical modulation device may include a nano-antenna, a conductor, and an active layer located between the nano-antenna and the conductor. The optical modulation device may further include a first dielectric layer located between the active layer and the conductor and a second dielectric layer located between the active layer and the nano-antenna. The optical modulation device may further include a signal applying unit configured to independently apply an electrical signal to at least two of the nano-antenna, the active layer, and the conductor.