Organic Light Source Probe for Optogenetics
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Solution Overview
Problem
Existing optogenetic probes using micro-light-emitting diodes (pLEDs) face issues with heat generation and low power efficiency, which can damage neurons and have inaccurate light emission due to the limitations of waveguide-based light delivery systems.
Innovation Solution
Integration of an organic light source on a probe with a finely patterned thin film encapsulation layer, including a light emitting layer made of organic material, to enhance light emission efficiency and reduce heat production, using a method that involves depositing electrodes and encapsulation layers with precise patterning techniques such as photoresist lift-off and atomic layer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro-light-emitting diode (pLED) is integrated within the probe to induce a laser beam, then light emission capability is improved, but local heat generation increases which can damage neurons
Solution Approach 1:
The patent changes the material parameters of the light source from inorganic pLED to organic OLED, which fundamentally alters the emission characteristics. Organic LEDs operate at lower temperatures and can be precisely controlled to emit specific wavelengths that match photoprotein absorption peaks, thereby improving light emission efficiency while reducing harmful heat generation.
Solution Approach 2:
The patent employs pulsed or periodic light emission rather than continuous operation. By controlling the organic LED to emit light in periodic pulses synchronized with neural activity or experimental requirements, the system achieves effective photostimulation while allowing heat dissipation between pulses, thus preventing local heat accumulation that could damage neurons.
2Ease of manufacture
If a waveguide is used to deliver light to the probe tip, then light delivery is simplified, but light loss increases resulting in low power efficiency
Solution Approach 1:
The patent extracts and eliminates the waveguide component from the system by directly integrating the organic LED at the probe tip. This removes the intermediate light transmission path that causes energy loss through absorption and scattering, while the flexible probe structure maintains the simplicity of light delivery. The organic LED's inherent flexibility allows direct integration without requiring rigid waveguide structures.
Solution Approach 2:
The patent introduces a transparent encapsulation layer as an intermediary between the organic LED and the external environment. This thin film structure protects the organic light source while maintaining optical transparency, allowing efficient light transmission to target neurons without the energy losses associated with traditional waveguide structures. The encapsulation layer serves as both a protective barrier and an optical window.
3Area of stationary object
If the light emitting layer is deposited to cover the entire surface, then coverage is improved, but electrode contact lines are obscured preventing electrical connection
Solution Approach 1:
The patent segments the probe surface into distinct functional zones: light-emitting regions where the organic LED material is deposited, and electrode contact regions where metal electrodes are exposed. This spatial segmentation is achieved through precise patterning techniques that deposit the light emitting layer only in specific areas, leaving contact lines clear for electrical connections. The segmentation allows both functions to coexist without interference.
Solution Approach 2:
The patent applies different material properties to different locations on the probe surface. The light emitting layer is deposited with specific optical properties in regions where light emission is required, while electrode contact lines maintain their electrical conductivity properties. This local differentiation of material quality ensures that each region performs its intended function optimally without compromising the other.
4Manufacturing precision
If photoresist is used for fine patterning of electrodes, then manufacturing precision is improved, but additional process steps are required increasing complexity
Solution Approach 1:
The patent merges multiple functions into the photoresist layer: it serves as both the patterning mask for defining electrode geometries and as an insulating layer that electrically isolates adjacent electrodes. By combining these functions into a single material layer, the patent achieves precise electrode patterning while reducing the total number of process steps compared to using separate masking and insulation layers.
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
The solution enables stable and localized photic stimulation of neurons with improved light emission efficiency and reduced heat production, allowing for accurate brain research and precise neural signal measurement.
Implementation Method 1
An organic light-emitting diode (OLED) is a thin film LED made of a film of an organic compound, where a light-emitting layer emits light through electron-hole recombination.
Implementation Method 2
The depositing of the light emitting layer may include depositing the light emitting layer in high vacuum using a thermal evaporator.
Implementation Method 3
The depositing of the first electrode may include forming a fine pattern on the first thin film encapsulation layer using a photoresist, depositing a metal layer on the fine pattern, and forming the first electrode in the first region by performing lift-off on the metal layer.
Implementation Method 4
The coating of the entire surface of the wafer with the thin film encapsulation layer may include coating the entire surface of the wafer with the thin film encapsulation layer through atomic layer deposition (ALD) and spin coating.
Data Source
AI summary
Disclosed are a probe integrated with an organic light source and a manufacturing method thereof. An organic light source integration method includes forming a first thin film encapsulation layer on a probe shank, depositing a first electrode in a first region on the first thin film encapsulation layer, depositing an insulating layer in a second region on the first thin film encapsulation layer, depositing a light emitting layer on the first electrode and the insulating layer, depositing a second electrode on the light emitting layer, and forming a second thin film encapsulation layer on the second electrode.