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Related Concept Videos

Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Chemical Synapses01:26

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Overview of Synapses01:25

Overview of Synapses

A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Chemical Synapses01:26

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Neuronal Communication

Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...

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A Reconfigurable All-Optical-Controlled Synaptic Device for Neuromorphic Computing Applications.

Tao Zhang1, Chao Fan2, Lingxiang Hu3

  • 1State Key Laboratory of Silicon and Advanced Semiconductor Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Nano
|June 13, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel all-optical controlled synaptic device using IGZO/SnO/SnS heterostructures. This device mimics retinal function, enabling efficient optical signal processing and artificial neural network applications.

Keywords:
artificial synapsesbidirectional photoresponseheterojunctionsphotoelectronic synapsestin monosulfidetin monoxide

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Area of Science:

  • Materials Science
  • Neuroscience
  • Optoelectronics

Background:

  • Neuromorphic visual systems require effective retina-inspired sensors.
  • Achieving bidirectional synaptic behavior and high performance under photostimulation remains challenging.

Purpose of the Study:

  • To propose a reconfigurable all-optical controlled synaptic device.
  • To integrate sensing, storage, and processing functions for neuromorphic applications.

Main Methods:

  • Fabrication of junction field-effect transistors using an IGZO/SnO/SnS heterostructure.
  • Utilizing energy band engineering for bidirectional photoresponse.
  • Testing synaptic behavior under various light stimuli (UV and visible light).

Main Results:

  • Demonstrated bidirectional synaptic excitatory and inhibitory behaviors without external voltage modulation.
  • Achieved a 91% recognition rate for handwritten numerals using an artificial neural network simulator.
  • Successfully demonstrated image recognition and simulated retinal damage using an 8x8 optoelectrical synaptic array.

Conclusions:

  • The IGZO/SnO/SnS heterostructure offers a viable strategy for high-performance all-optical controlled optoelectronic synapses.
  • This work presents a practical approach for designing multifunctional artificial neural vision systems.
  • The device shows potential for advanced image processing and understanding retinal damage mechanisms.