Related Experiment Video
Updated: Aug 9, 2025
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
19.0K
Chiral hybrid waveguide-plasmon resonances
Optics Express
|February 24, 2023
Summary
We developed a hybrid plasmonic system exhibiting strong circular dichroism (CD) by coupling waveguide modes to metal-insulator-metal gammadions. This system offers tunable CD responses for potential applications in chiral sensing and imaging.
Area of Science:
- Plasmonics
- Nanophotonics
- Chiroptical Spectroscopy
Background:
- Metal-insulator-metal (MIM) nanostructures support localized surface plasmon resonances (LSPRs).
- Dielectric slab waveguides confine and guide light.
- Chiroptical responses are crucial for sensing and imaging applications.
Purpose of the Study:
- To investigate chiroptical responses of hybrid systems combining MIM gammadions and dielectric slab waveguides.
- To demonstrate tunable circular dichroism (CD) through waveguide-plasmon coupling.
- To explore potential applications in chiral selective technologies.
Main Methods:
- Fabrication of hybrid metal-insulator-metal gammadion arrays on dielectric slab waveguides.
- Coupling of transverse magnetic (TM) and transverse electric (TE) waveguide modes to antisymmetric LSPRs.
- Analysis of chiroptical responses, including circular dichroism (CD) and quality factors.
Main Results:
- Formation of narrow hybrid waveguide-plasmon resonances (WPRs) by coupling waveguide modes to MIM gammadions.
- TE-WPRs exhibit strong dependence on incident light handedness, leading to significant CD peaks.
- Tunable CD peaks over a wide spectral range by adjusting lattice period or slab thickness.
Conclusions:
- The proposed hybrid system achieves strong, tunable CD responses with narrow linewidths.
- This platform shows promise for applications in chiral selective imaging, plasmonic bio-sensing, and spectroscopy.
Related Concept Videos
01:28Standing Waves in a Cavity
977
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
977
01:21IR Absorption Frequency: Hybridization
735
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...
735
02:16Resonance and Hybrid Structures
17.2K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
17.2K
03:24Hybridization of Atomic Orbitals I
47.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
47.5K
02:52Resonance
54.7K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
54.7K