Wide-Angle Beam Steering Using Tunable Liquid Lenses
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Solution Overview
Problem
Existing beam steering technologies, such as mechanical methods and non-mechanical options like SLMs, face limitations in achieving wide-angle scanning with minimal loss and without moving components, particularly in applications like LIDAR and microscopy.
Innovation Solution
A beam steering apparatus utilizing a small-angle beam steering element with tunable liquid lenses, a numerical aperture converter, and a wide-angle lens, enabling continuous 1D and 2D beam steering up to ±75° by compensating for divergence changes with multiple variable lenses, including electrowetting or pressure-driven liquid lenses and resonant modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical beam steering methods (scanning mirrors, rotating prisms) are used, then beam steering capability is achieved, but device reliability deteriorates due to limited lifetime of mechanical parts
Solution Approach 1:
The patent replaces mechanical beam steering components (scanning mirrors, rotating prisms) with non-mechanical liquid-based adaptive optical components that have no moving parts, thereby eliminating mechanical wear and extending device lifetime while maintaining beam steering capability
Solution Approach 2:
The patent employs pressure-driven liquid lenses where hydraulic pressure is used to dynamically adjust the curvature and focal length of liquid lens elements, enabling beam steering and focusing without any mechanical moving parts
2Reliability
If SLMs (spatial light modulators) are used for beam steering, then non-mechanical beam steering is achieved, but energy loss increases due to diffraction effects
Solution Approach 1:
The patent replaces SLMs with liquid-based adaptive optical components that manipulate light through refractive index changes rather than diffraction, reducing energy loss while maintaining non-mechanical operation
Solution Approach 2:
The patent dynamically changes the refractive index and curvature parameters of liquid lens elements to achieve beam steering and focusing, avoiding the diffraction losses inherent in SLM-based approaches
3Device complexity
If single variable lens is used for beam steering, then device complexity is reduced, but beam steering angle is limited
Solution Approach 1:
The patent combines multiple liquid lens elements with different functions (beam steering lenses with decentered configurations and focal length adjustment lenses with centered configurations) into a single integrated optical system, achieving wide-angle beam steering while managing overall system complexity
Solution Approach 2:
The patent employs decentered lens configurations where lenses are positioned off the optical axis, enabling beam steering in multiple dimensions and achieving wider steering angles through geometric arrangement rather than simply adding more lenses
4Speed
If electrowetting liquid lenses are used, then fast response time is achieved, but aperture size is limited
Solution Approach 1:
The patent employs pressure-driven liquid lens technology where hydraulic pressure can actuate large-aperture liquid lenses with fast response times, overcoming the aperture limitations of electrowetting-based systems
5Ease of operation
If beam steering angle is increased to ±75°, then wide-angle scanning capability is achieved, but divergence control becomes more difficult
Solution Approach 1:
The patent combines beam steering and divergence compensation functions into a single integrated liquid lens system where the same variable focal length lens performs both beam steering and divergence control, eliminating the need for separate compensation mechanisms
Solution Approach 2:
The patent employs dynamically adjustable liquid lens elements where the focal length and curvature can be changed in real-time to compensate for divergence effects at different steering angles, enabling wide-angle scanning with maintained beam quality
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 solution provides ultra-wide angle beam steering with controlled spot size, enhancing scanning capabilities for applications like LIDAR and microscopy, offering a compact, low-loss, and robust non-mechanical alternative with fast response times and large tunable focal lengths.
Implementation Method 1
The small-angle beam steering element might comprise either one- or two-dimensional beam steering with tunable liquid lenses... Electrowetting or pressure-driven liquid lenses or prisms (or combinations of these) work well
Implementation Method 2
The other uses a pressure-driven elastic membrane
Implementation Method 3
The second lens steers the beam according to its power, and the first lens compensates for divergence changes that would otherwise result from the changing power of the first lens
Implementation Method 4
The wide-angle lens element is designed to substantially increase the scanning angle provided by the small-angle beam steering element
Implementation Method 5
The N.A. converter operates to convert a narrow beam to an expanding, high N.A. beam suitable for LIDAR and the like
Data Source
AI summary
Wide-angle beam steering using two or more variable lenses to form a small-angle beam steering element, along with a numerical aperture converter and a wide-angle lens. The small-angle beam steering element might comprise either one- or two-dimensional beam steering with tunable liquid lenses.