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Dielectric Polarization in a Capacitor

Dielectric Polarization in a Capacitor

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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On-chip multifunctional polarizer based on phase change material.

YuQian Long, Yedeng Fei, Yin Xu

|December 1, 2023

Summary

This summary is machine-generated.

This study introduces a novel multifunctional polarizer using germanium antimony selenide telluride (GSST) in a silicon waveguide. The device offers reconfigurable transverse electric (TE) and transverse magnetic (TM) polarization control by switching the GSST state.

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Area of Science:

Photonics and Optical Engineering
Materials Science
Nanotechnology

Background:

Polarizers are crucial optical components for filtering light polarization states.
Phase change materials like Germanium Antimony Selenide Telluride (GSST) offer reconfigurable functionalities in optical systems.
Silicon photonics enables miniaturized and integrated optical devices.

Purpose of the Study:

To design a multifunctional polarizer utilizing a GSST-embedded silicon waveguide.
To achieve reconfigurable transverse electric (TE) and transverse magnetic (TM) pass functionalities.
To evaluate the device's performance in terms of extinction ratio (ER) and insertion loss (IL).

Main Methods:

Design of a silicon waveguide integrated with a GSST material.
Leveraging the light absorption properties of crystalline GSST.
Simulations to analyze polarizer performance at a wavelength of 1550 nm and over a range of wavelengths.

Main Results:

Achieved a TE-pass polarizer with an extinction ratio (ER) of 45.37 dB and insertion loss (IL) of 1.10 dB.
Achieved a TM-pass polarizer with an ER of 20.09 dB and IL of 1.35 dB.
Demonstrated a broad bandwidth (>200 nm for TE-pass, ~75 nm for TM-pass) with acceptable ER and IL.

Conclusions:

The designed GSST-based silicon waveguide polarizer offers multifunctional and reconfigurable polarization control.
The device exhibits excellent performance metrics, including high extinction ratios and low insertion losses.
This technology holds promise for advanced integrated optical systems requiring dynamic polarization management.