Metasurface Optical Components for Achromatic Light Deflection

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Solution Overview

Problem

Conventional refractive and diffractive optical components suffer from chromatic aberrations and wavelength-dependent performance, limiting their effectiveness in applications requiring broadband light manipulation.

Innovation Solution

The use of metasurface optical devices with non-periodic gap distances and dielectric resonators that impart phase shifts ranging from 0 to 2π, compensating for wavelength-dependent dispersion by designing a phase function that maintains consistent deflection angles or focal lengths across multiple wavelengths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional refractive or diffractive optical components are used, then light manipulation function is achieved, but chromatic aberrations and wavelength-dependent performance occur

Engineering Contradiction:

Improveoptical performance consistencyVSAvoidchromatic aberrations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the fundamental operating parameter from gradual phase accumulation (refractive) or simple interference (diffractive) to resonant phase control using metasurface elements. Each metasurface element is designed with specific resonant properties that enable precise phase modulation independent of wavelength, achieving achromatic beam deflection and focusing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite metasurface structures combining multiple resonant elements with different geometries and materials (e.g., dielectric rods, metallic patterns) to achieve simultaneous control over phase, amplitude, and polarization. This composite approach enables broadband achromatic performance by combining the advantages of different material systems

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If diffractive optical elements are used, then chromatic dispersion is generated for wavelength separation, but imaging quality degrades due to chromatic aberrations

Engineering Contradiction:

Improvewavelength separation capabilityVSAvoidimaging quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by designing different metasurface elements at different spatial locations with tailored resonant properties. Each element is optimized for its specific position and function, enabling simultaneous wavelength separation and high-quality imaging by locally controlling the phase and amplitude response for different wavelengths

Inventive Principle:

Principle #3Local quality

3Ease of operation

If refractive optics with material dispersion are used, then wavefront control is achieved through gradual phase accumulation, but deflection angle and focal length become wavelength-dependent

Engineering Contradiction:

Improvewavefront controlVSAvoidwavelength dependence

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes the mechanical propagation-based phase accumulation mechanism with a resonant interaction mechanism. Instead of relying on the physical path length and material dispersion, the metasurface elements use electromagnetic resonance to directly impose the desired phase profile, eliminating the inherent wavelength dependence of refractive optics

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Achieves achromatic behavior in optical components, such as beam deflectors and lenses, with uniform intensity and deflection angles across a range of wavelengths, reducing chromatic aberrations and enabling thinner, more efficient optical systems.

Implementation Method 1

the dielectric resonators have nonperiodic gap distances between adjacent dielectric resonators; and each silicon dielectric resonator has a width, a length, and a thickness configured to scatter incident light and impart a phase shift

Methodology Applied

Scientific EffectLight scattering: Scattering

Implementation Method 2

impart a phase shift, ranging at least from 0 to 2π, on an outgoing light

Methodology Applied

Scientific EffectPhase shift:

Data Source

PatentUS12517370B2Use of metasurface optical components to alter incident light

Publication Date: 2026.01.06 PRESIDENT & FELLOWS OF HARVARD COLLEGE

AI summary

Metasurface optical components deposited on the surface of a substrate are used to alter incident light. The metasurface optical components comprise a pattern of silicon dielectric resonators that have nonperiodic gap distances between adjacent silicon dielectric resonators; and each silicon dielectric resonator is an elongated rectangular prism that has a width, a length, and a thickness. Incident light is directed to the metasurface optical components, wherein the gap distances, the widths, and the thicknesses are configured to scatter the incident light and impart a phase shift, ranging at least from 0 to 2π, on an outgoing light. Each dielectric resonator has a rectangular cross-section in a plane perpendicular to the substrate surface such that a first phase shift is imparted for a transverse-electric (TE) component of the incident light and a second phase shift is imparted for a transverse-magnetic (TM) component of the incident light.