Related Experiment Video
Updated: Jun 24, 2025
00:07
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.4K
Pseudo coherent-perfect-absorption approach toward perfect polarization conversion.
Optics Express
|June 11, 2024
Summary
Researchers achieved perfect polarization conversion for circular light states using coherent perfect absorption. This method, utilizing bound states in the continuum (BIC), efficiently controls light polarization across the entire Poincaré sphere.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
Background:
- Polarization is a fundamental property of light crucial for various applications.
- Existing methods for polarization manipulation using resonance in mirror-symmetry systems suffer from imperfect conversion due to residual light.
Purpose of the Study:
- To demonstrate perfect polarization conversion for circular polarization states.
- To expand the range of achievable output polarization states.
- To apply the concept of coherent perfect absorption to polarization manipulation.
Main Methods:
- Utilizing the concept of coherent perfect absorption.
- Leveraging resonant frequencies for perfect conversion.
- Combining momentum-dependent radiative coupling from bound states in the continuum (BIC) with phase delay.
- Implementing a guided mode resonance in a dielectric photonic crystal slab.
Main Results:
- Achieved perfect polarization conversion for circular polarization states.
- Demonstrated that operation at the resonant frequency is the sole requirement for perfect conversion.
- Showcased efficient enlargement of output polarization states to span the entire Poincaré sphere.
- Validated theoretical predictions with numerical results from a photonic crystal slab design.
Conclusions:
- Coherent perfect absorption offers a pathway to perfect polarization conversion.
- Bound states in the continuum (BIC) are key to enhancing polarization control.
- This work provides a foundation for advanced light polarization management in diverse applications.
More Related Videos
Related Concept Videos
01:29Potential Due to a Polarized Object
391
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
391
01:31Dielectric Polarization in a Capacitor
4.7K
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...
4.7K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:21IR Absorption Frequency: Hybridization
681
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
681
01:13Phasor Arithmetics
285
Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular...
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular...
285
01:04IR Absorption Frequency: Delocalization
786
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
In IR...
786