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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...

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Updated: May 26, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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

Published on: October 13, 2017

Excited-state spectroscopy on an individual quantum dot using atomic force microscopy.

Lynda Cockins1, Yoichi Miyahara, Steven D Bennett

  • 1Department of Physics, McGill University, 3600 rue University, Montreal, Quebec H3A2T8, Canada.

Nano Letters
|December 28, 2011
PubMed
Summary
This summary is machine-generated.

We developed a new charge sensing method for quantum dot spectroscopy without electrodes. This technique uses an atomic force microscope cantilever to measure electron tunneling and reveal excited-state levels and spectra.

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Last Updated: May 26, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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Published on: October 13, 2017

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Area of Science:

  • Quantum Information Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Individual quantum dots are crucial for quantum computing.
  • Characterizing quantum dot energy levels requires precise measurement techniques.
  • Existing methods often need complex electrode fabrication.

Purpose of the Study:

  • To introduce a novel, electrode-free charge sensing technique for excited-state spectroscopy of quantum dots.
  • To demonstrate the capability of measuring single-electron tunneling and energy spectra.
  • To showcase the versatility of atomic force microscopy in quantum dot characterization.

Main Methods:

  • Utilizing an oscillating atomic force microscope (AFM) cantilever as a movable charge sensor and gate.
  • Measuring single-electron tunneling between an individual InAs quantum dot and a back electrode.
  • Analyzing cantilever dissipation versus bias voltage curves at varying oscillation amplitudes to form a Coulomb diamond-like diagram.

Main Results:

  • Successfully obtained excited-state levels and electron addition spectra from the generated diagrams.
  • Observed signatures indicative of inelastic tunneling (phonon emission) or electrode density of states.
  • Demonstrated the technique's ability to provide detailed spectroscopic information without patterned electrodes.

Conclusions:

  • The presented atomic force microscope-based charge sensing technique offers a versatile, electrode-free approach for quantum dot spectroscopy.
  • This method enables the characterization of excited-state properties and electron tunneling dynamics.
  • The technique holds promise for advancing quantum dot research and device characterization.