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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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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Related Experiment Video

Updated: Mar 1, 2026

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
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Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition

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The Optical Janus Effect: Asymmetric Structural Color Reflection Materials.

Grant T England1, Calvin Russell1, Elijah Shirman1,2

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.

Advanced Materials (Deerfield Beach, Fla.)
|June 7, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel hybrid material with a unique optical Janus effect, displaying different colors on each side. This innovation enhances color saturation and directional properties for diverse applications.

Keywords:
absorptionmultilayersphotonic crystalsstructural colorthin films

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Structurally colored materials offer photobleaching resistance and angle-dependent optical properties.
  • Incorporating absorption enhances color saturation by reducing nonspecific scattering in imperfect structures.
  • Combining absorption with structural coloration can lead to emergent optical phenomena.

Purpose of the Study:

  • To introduce a new hybrid architecture for achieving a highly directional optical effect.
  • To create an optical Janus effect by localizing absorption within a structurally colored multilayer.
  • To enable precise design of optical Janus structures with controlled color, pattern, and fabrication.

Main Methods:

  • Fabrication of a hybrid material with a thin absorbing layer within a transparent, structurally colored multilayer.
  • Systematic characterization of optical properties based on geometry and composition.
  • Coupling experimental studies with theoretical analysis for rational design.

Main Results:

  • Demonstration of an optical Janus effect where the material exhibits different colors on opposing sides.
  • Successful characterization and design of structures with controlled optical properties.
  • Validation of the hybrid architecture's ability to produce unique directional optical effects.

Conclusions:

  • The developed hybrid architecture effectively creates an optical Janus effect.
  • This approach allows for precise control over color, pattern, and fabrication of asymmetrically colored materials.
  • Potential applications include art, architecture, semitransparent solar cells, and anticounterfeiting security features.