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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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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,...
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Fabrication of Polymer Microspheres for Optical Resonator and Laser Applications
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Micro-optical vibrometer/accelerometer using dielectric microspheres.

Amir R Ali

    Applied Optics
    |June 29, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optical vibrometer/accelerometer using micro-optical dielectric sensors. The device achieves high resolution up to 8 nanogram (nano-g) for precise vibration and acceleration measurements.

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    Area of Science:

    • Optoelectronics
    • Micro-optics
    • Sensor Technology

    Background:

    • Whispering gallery modes (WGM) offer sensitive optical detection.
    • Micro-optical dielectric sensors require novel designs for vibration measurement.

    Purpose of the Study:

    • To design and demonstrate an optical vibrometer/accelerometer.
    • To utilize WGM phenomena for high-resolution vibration sensing.

    Main Methods:

    • Fabrication of a polydimethylsiloxane (PDMS) spherical dielectric sensor.
    • Integration of the sensor between a piezo stack and a proof mass.
    • Analysis of WGM shifts in response to induced vibrations.

    Main Results:

    • The sensor demonstrated high resolution up to 8 nanogram (nano-g).
    • Achieved a sensitivity of dλ/da≈2.33 pm/μg.
    • Validated WGM shifts correlate with vibration/acceleration.

    Conclusions:

    • The proposed optical sensor effectively measures vibration and acceleration.
    • WGM-based sensors show promise for high-resolution inertial sensing.
    • Further calibration and experimental analysis confirm sensor performance.