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Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Controllable EIT-like mode splitting in a chiral microcavity.

Guolin Zhao, Jiefu Zhu, Jiankun Hou

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    |February 1, 2023
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    Researchers demonstrate controllable electromagnetically induced transparency (EIT)-like mode splitting in a microcavity. This EIT-like effect can be tuned by input power and phase, offering potential for all-optical information processing devices.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Microcavity Physics

    Background:

    • Coupled resonance modes can create unique transmission spectra through internal interference.
    • Electromagnetically induced transparency (EIT) and optical mode splitting are examples of such phenomena.
    • Controlling individual modes is key for practical applications in manipulating transmission spectra.

    Purpose of the Study:

    • To experimentally demonstrate controllable electromagnetically induced transparency (EIT)-like mode splitting in a single microcavity.
    • To investigate the influence of input power and relative phase on mode splitting.
    • To explore chiral behaviors arising from asymmetric scattering in the microcavity.

    Main Methods:

    • Utilized a single microcavity with double-port excitation.
    • Experimentally controlled mode splitting by varying the power of two input signals.
    • Adjusted the relative phase between the two input signals to influence the mode splitting.
    • Investigated asymmetric scattering effects leading to chiral behaviors.

    Main Results:

    • Achieved controllable EIT-like mode splitting in a microcavity.
    • Demonstrated effective control over mode splitting by tuning input power and relative phase.
    • Observed chiral behaviors in mode splitting due to asymmetric scattering, resulting in Fano-like resonance.
    • Showcased tunability of the transmission spectra through controlled mode interactions.

    Conclusions:

    • The study presents a method for controllable EIT-like mode splitting in a microcavity.
    • The observed chiral Fano-like resonance offers unique optical properties.
    • This platform provides a compact and tunable solution for all-optical information processing applications.