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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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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Electrically Modulated Multilevel Optical Chirality in GdFeCo Thin Films.

Jun-Xiao Lin^1,2, Bo-Jun Chen¹, Shih-Min Hung¹

¹Department of Applied Physics, National Pingtung University, No. 4-18, Minsheng Road, 90044 Pingtung, Taiwan.

ACS Applied Electronic Materials

|January 20, 2025

Summary

This summary is machine-generated.

Researchers dynamically controlled optical ellipticity in GdFeCo alloys using electrical current and low magnetic fields. This method enables tunable light polarization for advanced optical devices.

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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Area of Science:

Materials Science
Condensed Matter Physics
Optics

Background:

Ferrimagnetic alloys like Gadolinium-Iron-Cobalt (GdFeCo) exhibit tunable magnetic and optical properties.
Controlling optical ellipticity is crucial for developing advanced optical devices and manipulating light polarization.

Purpose of the Study:

To introduce a simple method for dynamic control of multilevel optical ellipticity in GdFeCo alloys.
To investigate the role of magnetic compensation temperature and composition in manipulating circular dichroism (CD).

Main Methods:

Utilizing Joule heating from electrical current to switch spin orientation, assisted by a low magnetic field (3.5 mT).
Fabricating GdFeCo alloys with magnetic compensation temperatures near or above room temperature.
Analyzing circular dichroism (CD) across the visible (vis) to ultraviolet (UV) photon energy range.

Main Results:

Demonstrated dynamic control over optical ellipticity by manipulating spin orientation.
Achieved transformation of linearly polarized light to elliptically polarized light and reversed rotation direction.
Showcased the dominant contribution of FeCo to CD in the vis-to-UV range, ensuring optical ellipticity stability near compensation temperatures.

Conclusions:

GdFeCo thin films offer significant potential for applications in chiral optics.
Selective contributions of rare-earth and transition-metal elements to CD phenomena are highlighted.
The developed method facilitates the design of advanced optical devices leveraging energy-resolved CD.