Related Experiment Video
Updated: Dec 26, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.6K
Circular Phase-Dichroism of Chiral Metasurface Using Birefringent Interference
Ranran Zhang1,2, Qiuling Zhao1, Xia Wang1
1Optoelectronic Materials and Technologies Engineering Laboratory, Shandong, Physics Department, QingDao University of Science and Technology, Shandong 266061, China.
Nano Letters
|March 18, 2020
Summary
We introduce a new birefringent interference method to measure circular phase-dichroism (CPD) for chiral metasurfaces. This technique offers a robust way to characterize surface properties, complementing traditional circular dichroism (CD).
Area of Science:
- Nanophotonics and Metasurface Characterization
- Optical Physics
- Chirality Studies
Background:
- Circular dichroism (CD) typically probes bulk properties of materials.
- Circular phase-dichroism (CPD) offers insights into surface properties of chiral metasurfaces.
- Previous CPD measurements utilized air-gap Fabry-Perot setups for 2D chiral metasurfaces.
Purpose of the Study:
- To propose and demonstrate a robust birefringent interference approach for measuring CPD.
- To characterize chiral metasurfaces by analyzing their surface optical properties.
- To provide an alternative and potentially more versatile method for CPD determination.
Main Methods:
- Utilized a uniaxial birefringent material to replace air gaps in interference setups.
- Exploited the difference in refractive indices for ordinary and extraordinary light components for interference.
- Measured transmission phases of metasurfaces fabricated on birefringent sapphire substrates.
Main Results:
- Successfully obtained clear CPD signals for chiral metasurfaces.
- Observed vanishing CPD for achiral metasurfaces, validating the method's specificity.
- Demonstrated the applicability of the approach to metasurfaces on nonbirefringent substrates using add-on birefringent materials.
Conclusions:
- The proposed birefringent interference method is a robust technique for CPD measurement.
- This approach effectively characterizes the chirality of metasurfaces based on surface properties.
- The method shows promise for broader applications in metasurface analysis, including those on non-birefringent substrates.
More Related Videos
08:48Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
Published on: September 25, 2020
6.1K
09:38Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
Published on: January 3, 2018
7.5K
Related Concept Videos
02:25Chirality
28.8K
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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
28.8K
02:18Interference and Diffraction
51.3K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
51.3K
01:26Phase Contrast and Differential Interference Contrast Microscopy
11.8K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
11.8K
02:30Chirality in Nature
16.3K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
16.3K
02:25Molecules with Multiple Chiral Centers
14.6K
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...
14.6K
02:05Prochirality
4.7K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.7K