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Related Concept Videos

Encoding01:19

Encoding

Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Molecular all-photonic encoder-decoder.

Joakim Andréasson1, Stephen D Straight, Thomas A Moore

  • 1Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. a-son@chalmers.se

Journal of the American Chemical Society
|July 30, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a molecular triad that acts as an all-photonic encoder and decoder. This molecule compresses and recovers digital information using light, enabling potential applications in data manipulation and nanoscale object tracking.

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Area of Science:

  • Molecular Engineering
  • Photochemistry
  • Data Science

Background:

  • Data processing relies on encoders for compression and decoders for information recovery.
  • Photochromic molecules offer potential for light-controlled data manipulation.

Purpose of the Study:

  • To report a novel molecular triad functioning as an all-photonic single-bit 4-to-2 encoder and 2-to-4 decoder.
  • To demonstrate the molecule's capability for reversible data compression and recovery using light stimuli.

Main Methods:

  • Synthesized a molecular triad comprising a dithienylethene core linked to two fulgimide photochromes.
  • Utilized light of different wavelengths to induce photoisomerization in the molecular components.
  • Measured absorbance and fluorescence emission to decode information.

Main Results:

  • The molecular triad successfully performed all-photonic 4-to-2 encoding and 2-to-4 decoding functions.
  • The system demonstrated stable cycling through numerous encoding and decoding operations with minimal photodecomposition.
  • Input information (wavelengths) was compressed into two output absorbance signals and subsequently recovered.

Conclusions:

  • A single molecule can perform complex data processing tasks, acting as both an encoder and decoder.
  • This molecular photonic device offers a new paradigm for light-based data manipulation.
  • Potential applications include nanoscale object tracking and advanced data storage solutions.