Stack-Integrated Metasurfaces for High-Precision Beam Steering

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Solution Overview

Problem

Existing optical metasurfaces lack the ability to efficiently steer and shape optical beams in multiple dimensions with high precision and low loss, particularly in tunable systems.

Innovation Solution

The development of tunable optical metasurfaces incorporating one-dimensional and two-dimensional arrays of optical resonators with high aspect ratios, utilizing metallic optical elements connected via metallic vias and dielectric materials with tunable refractive indices, allowing for precise beam steering and shaping through controlled phase modulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional optical metasurfaces are used, then manufacturing is simpler, but beam steering precision and shaping capability are insufficient

Engineering Contradiction:

Improvebeam steering precisionVSAvoidmetasurface structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The metasurface is segmented into multiple layers, each containing metallic optical elements at different positions and orientations. This multi-layer segmentation enables precise control of optical phase, amplitude, and polarization, achieving high-precision beam steering and shaping while maintaining manufacturability through modular fabrication processes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from two-dimensional planar metasurfaces to three-dimensional multi-layer structures with metallic optical elements positioned at varying depths. This dimensional extension provides additional degrees of freedom for optical control, enabling sophisticated beam manipulation capabilities that cannot be achieved with conventional single-layer designs

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If high aspect ratio resonators are implemented, then beam steering precision improves, but manufacturing difficulty increases

Engineering Contradiction:

Improveresonator aspect ratio precisionVSAvoidmanufacturing process difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

Each high aspect ratio metallic optical element is segmented into a stack of multiple lower aspect ratio sub-elements fabricated in separate lithography and deposition steps. This segmentation enables precise control of the overall aspect ratio through cumulative stacking, achieving the required precision without the difficulties of directly fabricating single high aspect ratio structures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Dielectric materials with tunable refractive indices are deposited and configured before final metallic element assembly. This preliminary action establishes the optical environment in advance, allowing subsequent metallic elements to be precisely positioned and sized to achieve target aspect ratios and optical performance

Inventive Principle:

Principle #10Preliminary action

3Loss of energy

If metallic optical elements with high aspect ratios are used, then optical loss is reduced, but device complexity increases

Engineering Contradiction:

Improveoptical lossVSAvoidoptical resonator complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent employs composite structures combining metallic optical elements with dielectric materials having tunable refractive indices. This composite approach leverages the low optical loss characteristics of metals at high aspect ratios while using dielectric materials to control and tune optical resonance, achieving reduced energy loss with manageable device complexity through material property optimization

Inventive Principle:

Principle #40Composite materials

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

Enables high-precision beam steering and shaping with reduced loss, suitable for applications in LiDAR, optical communications, and displays, by leveraging high-Q resonators and sub-wavelength structures manufactured using CMOS-compatible processes.

Implementation Method 1

optical resonators with high aspect ratios... high-Q resonators

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

controlled phase modulation

Methodology Applied

Scientific EffectPhase modulation: Phase Modulation

Implementation Method 3

dielectric materials with tunable refractive indices

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250328004A1Stack-Integrated Metasurface Devices and Sequential Damascene Manufacturing Processes

Publication Date: 2025.10.23 LUMOTIVE INC

AI summary

The disclosure includes an optical metasurface with an optical reflector layer and a resonator layer. The resonator layer includes an array of optical resonators extending vertically with respect to the optical reflector layer. Each optical resonator may be formed by two stack-integrated metallic optical elements positioned adjacent to each other to create a gap. The stack-integrated metallic optical elements may include a base metallic optical element and one or more stacked metallic optical elements.