Interferometry Applications
Interferometry Applications - Related Videos
11:47
Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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Cited by 13 •
2013
White light microscope interferometry is an optical, noncontact and quick method for measuring the topography of surfaces. It is shown how the method can be applied toward mechanical wear analysis, where wear scars on tribological test samples are analyzed; and in materials science to determine ion beam sputtering or laser ablation volumes and depths.
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Cited by 7 •
2013
Large laser-interferometers are being constructed to create a new type of astronomy based on gravitational waves. Their sensitivities, as for many other high-precision experiments, are approaching fundamental noise limits such as the atomic vibration of their components. We are pioneering technologies to overcome these limits using novel laser beam shapes.
07:18
Application of Biolayer Interferometry (BLI) for Studying Protein-Protein Interactions in Transcription
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Cited by 21 •
2019
Interactions of transcription factors (TFs) with the RNA polymerase are usually studied using pulldown assays. We apply a Biolayer Interferometry (BLI) technology to characterize the interaction of GrgA with the chlamydial RNA polymerase. Compared to pulldown assays, BLI detects real-time association and dissociation, offers higher sensitivity, and is highly quantitative.
05:13
Biolayer Interferometry Technology to Detect Interactions between Ligand and Analyte
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2025
In this video, we demonstrate biolayer interferometry (BLI) technology to detect the intermolecular interactions between ligands and target analytes in real-time. BLI measures changes in the interference pattern of white light reflected off a layer of immobilized ligands on a biosensor surface as they interact with analytes in solution.
13:57
Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects
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Cited by 117 •
2014
The protocols here describe kinetic assays of protein-protein interactions with Bio-layer Interferometry. F-type ATP synthase, which is involved in cellular energy metabolism, can be inhibited by its ε subunit in bacteria. We have adapted Bio-layer Interferometry to study interactions of the catalytic complex with ε’s inhibitory C-terminal domain.
FAQs
Interferometry applications extract measurements from changes in relative phase rather than relying only on direct intensity. After the paths are recombined, the phase difference determines the positions of bright and dark fringes. A displacement, wavelength change, or refractive-index variation alters the accumulated phase, so tracking fringe changes reveals the corresponding physical change with high precision.
Coherence is essential because the waves must maintain a suitable phase relationship while traveling through the separate paths. When coherent contributions are recombined, their phase difference produces a stable fringe pattern that can be compared as conditions change. This comparison converts very small path or material changes into observable fringe motion or variation, improving measurement sensitivity.
Material changes can be detected because refractive index affects the phase accumulated along a path. Even when the physical path length remains fixed, a change in the material’s optical properties can shift the relative phase and therefore the fringes. This makes interferometric methods useful for characterizing materials, not only for measuring mechanical displacement.
A typical workflow divides a coherent beam into separate paths, allows each path to accumulate its phase, and recombines the beams to produce fringes. The measurement then compares the resulting pattern with its pattern under changed conditions. Interpreting the shift connects the observed phase change to displacement, wavelength, or refractive index.
They are especially useful when researchers need to detect small changes in distance, phase, or material properties. Optical testing can assess surfaces, while spectroscopy and microscopy support investigations of materials and structures. The same underlying phase sensitivity supports characterization of surfaces and materials, allowing one measurement approach to serve several physics research areas.
Specialized interferometric systems apply the same phase-sensitive measurement principle in radio astronomy and gravitational-wave detection. In those settings, the method connects controlled comparisons of wave paths or signals with observations of phenomena that are otherwise difficult to measure. This broader use shows how interferometry links precision laboratory measurements to astronomical and gravitational-physics research.