Related Experiment Video
Updated: Mar 26, 2026
15:06
Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
13.5K
Summary
Giant transmission and reflection occur simultaneously in parity-time (PT) symmetric plasmonic metafilms. This effect vanishes in lossless substrates, enabling tunable lasers and absorbers.
Area of Science:
- Plasmonics
- Metamaterials
- Quantum Optics
Background:
- Parity-time (PT) symmetry offers unique control over electromagnetic wave propagation.
- Subwavelength metallic films with embedded PT-symmetric dimers exhibit exotic optical properties.
Purpose of the Study:
- To demonstrate giant transmission and reflection at the same wavelength using PT-symmetric plasmonic metafilms.
- To investigate the role of substrate loss and PT-dimer loss/gain on scattering phenomena.
- To explore the potential of these metafilms as tunable lasers or absorbers.
Main Methods:
- Fabrication and characterization of a subwavelength array of PT-symmetric dimers in a metallic film.
- Numerical simulations to analyze electromagnetic wave interaction with the metafilm.
- Tuning of substrate dissipation and PT-dimer gain/loss parameters.
Main Results:
- Giant transmission and reflection observed simultaneously at a specific wavelength.
- Phenomenon vanishes with a lossless metallic substrate.
- Super scattering achieved by increasing dimer loss or tuning near an exceptional point.
- Enhanced absorption near the exceptional point by increasing dimer gain.
Conclusions:
- PT-symmetric plasmonic metafilms can exhibit tunable super scattering.
- The metafilm can function as a PT-plasmonic laser or absorber based on parameter tuning.
- Super radiation is achievable in cavities by manipulating dissipation or lossy elements.
Related Concept Videos
01:25Atomic Absorption Spectroscopy: Interference
2.3K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
2.3K
01:22Lossy Lines and Overvoltages
385
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
385
01:14Molecular Spectroscopy: Absorption and Emission
5.4K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
5.4K
01:05Absorption of Radiation
1.5K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.5K
01:07Interference and Superposition of Waves
7.4K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
7.4K
01:22Carrier Generation and Recombination
1.5K
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
1.5K