Subwavelength Electrode Optical Modulation for Precise Beam Control
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Solution Overview
Problem
Existing technologies lack a simple and compact method for accurately modulating optical signals, particularly in photonic integrated circuits, to control parameters such as amplitude, phase, and wavelength, and enable applications like beam steering and holographic image formation.
Innovation Solution
A device comprising an active layer with a plurality of electrodes, each smaller than the optical signal wavelength, separated by distances also smaller than the wavelength, allows for local modulation of the refractive index and gain, enabling precise control of optical signals through electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional modulation methods are used, then optical signal control is achieved, but device complexity and size increase
Solution Approach 1:
The electrode layer is divided into multiple separate electrodes instead of using a single continuous electrode. Each electrode is dimensioned smaller than the optical wavelength and spaced closely together, creating discrete control regions that collectively provide accurate optical modulation while maintaining a compact integrated structure
Solution Approach 2:
Each separate electrode provides localized control of the optical signal in its associated region of the active layer. By independently controlling the electrical signal to each electrode, different local regions can have different modulation characteristics, enabling precise spatial control of optical properties throughout the device
2Measurement precision
If larger electrodes are used for control, then easier manufacturing is achieved, but modulation accuracy decreases
Solution Approach 1:
The electrode dimensions and spacing are specifically designed to be smaller than the optical wavelength. This parameter choice enables accurate optical modulation while remaining compatible with standard photonic fabrication processes, as the features are larger than typical nanoscale dimensions but small enough to provide precise control
3Measurement precision
If electrode spacing is increased, then easier fabrication is achieved, but modulation accuracy decreases
Solution Approach 1:
The electrode layer is divided into multiple separate electrodes instead of using a single continuous electrode. Each electrode is dimensioned smaller than the optical wavelength and spaced closely together, creating discrete control regions that collectively provide accurate optical modulation while maintaining a compact integrated structure
Solution Approach 2:
The electrode dimensions and spacing are specifically designed to be smaller than the optical wavelength. This parameter choice enables accurate optical modulation while remaining compatible with standard photonic fabrication processes, as the features are larger than typical nanoscale dimensions but small enough to provide precise control
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 provides accurate modulation of optical signals, allowing control of amplitude, phase, and wavelength, suitable for applications like beam steering, three-dimensional light field generation, and optical processing, with minimal impact on resonance conditions.
Implementation Method 1
The electrode layer provides an electro-optical effect by the electrical signal to the electrodes providing optical modulation
Implementation Method 2
an active layer configured to provide electrically controlled gain of the optical signal
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A device (100; 200) for modulation of an optical signal comprises: an active layer (102; 202) configured to provide electrically controlled gain of the optical signal; an electrode layer (104; 204) arranged to extend along the active layer (102; 202), wherein the electrode layer (104; 204) comprises a plurality of separate electrodes (106; 206a, 206b) associated with respective parts of the active layer (102; 200), wherein each electrode (106; 206a, 206b) have a size of a cross-section in the electrode layer (104; 204) smaller than a wavelength of the optical signal and neighboring electrodes are separated by a distance smaller than the wavelength of the optical signal; wherein an electrical signal to each of the electrodes (106; 206a, 206b) is controllable for locally modulating an imaginary part of a refractive index of the active layer (102; 202) by locally controlling an electrical signal in the active layer (102; 202).