Multimode Fiber Wavefront Shaping for Optogenetics Stimulation
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Solution Overview
Problem
Conventional optogenetics methods suffer from poor spatial selectivity and inability to achieve precise stimulation of chosen neuronal cells due to divergent light distribution from optical fibers, limiting the effective working range to a few hundred micrometers beneath the brain surface.
Innovation Solution
A method utilizing wavefront shaping with a multimode fiber, where a transmission matrix is calculated to compensate light distribution, allowing precise focusing of optical stimulation at specific neuronal cells through spatial and temporal modulation, enabling precise optical stimulation even at deeper brain regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional optical fiber stimulation is used, then the light can be delivered into deep tissue, but the light distribution is divergent and forms a large light spot that is much larger than the cell size, resulting in poor spatial selectivity
Solution Approach 1:
The transmission matrix of the multimode fiber is calculated in advance before the actual stimulation experiment. This preliminary calculation establishes the relationship between input modes and output spatial distribution, enabling subsequent wavefront shaping to achieve precise focusing at desired locations while maintaining stimulation depth capability.
Solution Approach 2:
The patent transforms the light input parameters by controlling the excitation modes of the multimode fiber. By adjusting which modes are excited and their relative phases, the light distribution at the output can be dynamically changed from a large divergent spot to a focused pattern matching the target cell size, thereby improving spatial selectivity without sacrificing penetration depth.
2Device complexity
If conventional optical stimulation systems are used, then the setup is relatively simple, but the effective working range is greatly limited to only a few hundred micrometers beneath the brain surface
Solution Approach 1:
The patent introduces the transmission matrix as an intermediary computational model that bridges the input light modes and the desired output spatial distribution. This mathematical intermediary enables the system to achieve deep tissue stimulation by calculating and applying the appropriate mode combinations, effectively extending the working range beyond the conventional limit while adding only moderate computational complexity.
3Ease of operation
If light is delivered through a tiny optical fiber, then free moving animal manipulations are enabled, but the divergent light spot is much larger than the cell size, preventing accurate stimulation of specific neurons
Solution Approach 1:
The patent applies dynamic control to the light input by using wavefront shaping that can be adjusted in real-time based on the target neuron position. The system dynamically modifies the excitation modes and phases of the multimode fiber to steer and focus the light pattern precisely on different neurons, enabling accurate stimulation while maintaining the flexibility needed for free-moving animal experiments.
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 approach significantly enhances spatial selectivity and stimulation depth, allowing for precise activation or inhibition of specific neuronal cells with minimal damage, achieving single-cell precision and improved temporal resolution.
Implementation Method 1
using a multimode fiber as a transmission fiber for optical stimulation signals
Implementation Method 2
performing wavefront compensation to a light to be input into the input end, according to the spatial position of the optical stimulation and the transmission matrix of the multimode fiber, to form a compensated expanded light
Implementation Method 3
the compensated expanded light, after being transmitted by the multimode fiber to the output end and output from the output end, is capable of focusing at the spatial position of the optical stimulation
Data Source
AI summary
A method for optogenetics experiments, based on wavefront shaping and including: calculating the transmission matrix between an input end and an output end of the multimode fiber under a fixed shape; implanting the output end into an intracranial space of an experimental subject; and performing wavefront compensation to a light to be input into the input end, according to the spatial position of the optical stimulation and the transmission matrix of the multimode fiber, to form a compensated expanded light, and inputting the compensated expanded light from the input end into the multimode fiber, such that the compensated expanded light, after being transmitted by the multimode fiber to the output end and output from the output end, is capable of focusing at the spatial position of the optical stimulation.