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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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,...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR spectroscopy,...

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Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Optical bistability due to increasing absorption.

D A Miller, A C Gossard, W Wiegmann

    Optics Letters
    |September 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Optical bistability, a phenomenon where a material

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    Patterning via Optical Saturable Transitions - Fabrication and Characterization
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    Published on: November 30, 2012

    Area of Science:

    • Nonlinear Optics
    • Condensed Matter Physics
    • Semiconductor Physics

    Background:

    • Optical bistability typically requires optical cavities or external feedback mechanisms.
    • Previous studies explored mirrorless bistabilities in specific physical systems.
    • Understanding nonlinear optical absorption is crucial for advanced photonic devices.

    Purpose of the Study:

    • To theoretically demonstrate optical bistability in materials with superlinearly increasing optical absorption.
    • To experimentally validate the theoretical predictions using a specific semiconductor system.
    • To establish a generalized principle for mirrorless optical bistabilities.

    Main Methods:

    • Theoretical analysis of optical absorption dependent on material excitation.
    • Experimental demonstration using a GaAs/GaAlAs multiple-quantum-well semiconductor.
    • Utilizing a thermal nonlinearity to induce the observed optical effects.

    Main Results:

    • Theoretical prediction of optical bistability without external feedback or cavities.
    • Experimental observation of optical bistability and differential gain.
    • Good agreement between theoretical models and experimental outcomes.

    Conclusions:

    • Optical bistability can be achieved in materials with specific nonlinear absorption properties.
    • The findings generalize previous observations of mirrorless bistabilities.
    • Semiconductor quantum wells offer a viable platform for realizing this phenomenon.