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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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,...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...

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Related Experiment Video

Updated: Jun 2, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

Quantum plexcitonics: strongly interacting plasmons and excitons.

A Manjavacas1, F J García de Abajo, P Nordlander

  • 1Instituto de Óptica-CSIC, Serrano 121, 28006 Madrid, Spain. a.manjavacas@csic.es

Nano Letters
|May 4, 2011
PubMed
Summary
This summary is machine-generated.

We developed a quantum mechanical method to study plasmon-exciton interactions in hybrid systems. This approach accurately describes Fano resonances and optical responses in coupled quantum dots and plasmonic nanostructures.

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Last Updated: Jun 2, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
08:04

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Published on: May 27, 2020

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12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Nanophotonics

Background:

  • Plasmonic nanostructures exhibit unique optical properties due to collective electron oscillations.
  • Excitonic systems, like quantum dots, possess discrete energy levels crucial for light-matter interactions.
  • Understanding the coupling between plasmons and excitons is vital for developing advanced optical devices.

Purpose of the Study:

  • To introduce a fully quantum mechanical formalism for describing plasmon-exciton coupling.
  • To investigate quantum aspects of optical response and Fano resonances in hybrid systems.
  • To provide a theoretical framework for analyzing strongly interacting plasmon-exciton systems.

Main Methods:

  • Utilizing Zubarev's Green function formalism.
  • Developing a non-perturbative approach for plasmonic nanostructure evolution.
  • Simulating quantum emitter-plasmonic nanostructure interactions.

Main Results:

  • The quantum mechanical approach accurately captures Fano resonances in plasmon-exciton (plexcitonic) systems.
  • Dramatic changes in optical absorption were observed in emitter-dimer structures when tuning the excitation level across the gap-plasmon resonance.
  • The method goes beyond perturbative descriptions of internal plasmonic nanostructure evolution.

Conclusions:

  • The presented Green function formalism offers a robust method for studying strongly coupled plasmon-exciton hybrid systems.
  • This work paves the way for novel designs and applications in nanophotonics and quantum information.
  • The findings highlight the importance of quantum mechanical treatments for accurate prediction of optical properties in hybrid nanostructures.