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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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,...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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 stretch at a...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Related Experiment Video

Updated: Jun 19, 2026

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Tunable Fano interference in intersubband absorption.

J Faist, C Sirtori, F Capasso

    Optics Letters
    |October 31, 2009
    PubMed
    Summary

    Researchers designed new quantum semiconductor structures showing strong Fano interference. Experiments demonstrate engineering Fano resonances and their evolution using electric fields.

    Area of Science:

    • Condensed matter physics
    • Quantum mechanics
    • Materials science

    Background:

    • Fano interference is a quantum mechanical phenomenon.
    • Quantum semiconductor structures are crucial for advanced electronic devices.
    • Understanding Fano effects in these structures is key to novel device applications.

    Purpose of the Study:

    • To design and demonstrate novel modulation-doped quantum semiconductor structures.
    • To investigate the strong Fano interference effects within these structures.
    • To explore the engineering of Fano resonances and their transitions.

    Main Methods:

    • Design of new modulation-doped quantum semiconductor structures.
    • Experimental investigation using intersubband absorption.

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  • Application of an electric field normal to the layers to modify the continuum.

    • Main Results:

    • Successful design and demonstration of quantum semiconductor structures with strong Fano interference.
    • Experimental evidence of engineered Fano resonances.
    • Observation of the evolution of Fano resonances toward bound-to-bound transitions.

    Conclusions:

    • Modulation-doped quantum semiconductor structures can exhibit strong Fano interference.
    • Fano resonances are engineerable via external electric fields.
    • This work opens possibilities for tunable quantum devices.