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Related Concept Videos

Electrical Synapses01:28

Electrical Synapses

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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.
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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.
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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.
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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...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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On-chip photonic synapse.

Zengguang Cheng1, Carlos Ríos1, Wolfram H P Pernice2

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

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|September 30, 2017
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Summary
This summary is machine-generated.

Researchers developed an optical hardware synapse for neuromorphic computing. This photonic integrated circuit mimics brain synapses using phase-change materials, enabling ultrafast, high-bandwidth, and energy-efficient processing.

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Area of Science:

  • Neuroscience
  • Computer Science
  • Materials Science

Background:

  • Neuromorphic computing aims to replicate the brain's efficient information processing.
  • Hardware synapses are crucial for developing brain-inspired computing architectures.
  • Existing approaches face limitations in speed, bandwidth, and power consumption.

Purpose of the Study:

  • To develop a novel hardware synapse for neuromorphic computing.
  • To leverage photonic integrated circuits for synapse emulation.
  • To achieve continuously variable synaptic plasticity.

Main Methods:

  • Implementation of a hardware synapse using phase-change materials.
  • Utilizing silicon nitride waveguides for optical signal transmission.
  • Controlling synaptic weight by varying the number of optical pulses.

Main Results:

  • Demonstration of a purely optical hardware synapse.
  • Achieved ultrafast operation speeds and virtually unlimited bandwidth.
  • Enabled random setting of synaptic weight via optical pulses, mimicking biological plasticity.

Conclusions:

  • The developed optical synapse offers a promising pathway for advanced neuromorphic computing.
  • Photonic integrated circuits provide significant advantages over electronic approaches.
  • This technology paves the way for energy-efficient, high-performance brain-inspired systems.