Single SLM Multi-Wavelength Optical Stimulation
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Solution Overview
Problem
Conventional methods for optically stimulating specimens with multiple wavelengths require expensive, complex systems with multiple spatial light modulators (SLMs) or low-frequency single-panel displays, which introduce unwanted time dependence due to slow neuron responses.
Innovation Solution
An optical method utilizing a single SLM to generate interleaved multi-wavelength images by alternating light pulses of different wavelengths at high frequencies, ensuring simultaneous stimulation without introducing time delays detectable by the specimen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SLMs are used to generate multi-wavelength images, then the optical stimulation capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple SLMs into a single SLM that can display multiple wavelengths. The single SLM is controlled to present different wavelength images in rapid succession, merging the functions of multiple SLMs while reducing system complexity and cost.
Solution Approach 2:
The single SLM is designed to perform multiple functions by displaying images at different wavelengths sequentially. This multi-functional approach allows one SLM to replace multiple specialized SLMs, reducing device complexity while maintaining optical stimulation capabilities.
2Device complexity
If a conventional single-panel display system is used, then the device complexity is reduced, but the operating frequency becomes too low for neuron responses
Solution Approach 1:
The patent employs periodic action by rapidly alternating between different wavelength images at high frequencies (e.g., 60 Hz or higher). This periodic display of multi-wavelength images enables the system to operate at frequencies suitable for neuronal responses while maintaining relative system simplicity.
3Device complexity
If conventional single-panel display is used, then the system is simpler, but time-dependent artifacts are introduced due to slow color switching
Solution Approach 1:
By implementing rapid periodic switching between wavelength images at high frequencies, the patent eliminates time-dependent artifacts. The rapid alternation ensures that the specimen perceives simultaneous multi-wavelength stimulation rather than sequential color changes, thereby removing harmful time-dependent effects while maintaining system simplicity.
Data Source
AI summary
A method for driving an optical device for optical stimulation. In step (1) upon loading a first image pattern associated with light of a first wavelength into an SLM, the SLM is illuminated with light of the first wavelength for a first time period while the light of the second wavelength is off. In step (2) upon loading a second image pattern associated with light of a second wavelength into the SLM, the SLM is illuminated with light of the second wavelength for a second time period while the light of the first wavelength is off. The steps (1) and (2) are iteratively repeated, in that order, until a predetermined stimulation duration is attained. The first time period and the second time period are both shorter than a response time of a specimen (e.g., neuron(s)) that is being optically stimulated.