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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Related Experiment Video

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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters
14:58

Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters

Published on: June 2, 2010

Active spectral filtering through turbid media.

Jung-Hoon Park1, ChungHyun Park, Hyunseung Yu

  • 1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.

Optics Letters
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

We show how to control light focusing in scattering media by wavelength. Wavefront shaping allows independent control and simultaneous focusing of multiple wavelengths through turbid materials.

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Area of Science:

  • Optics
  • Photonics
  • Materials Science

Background:

  • Light propagation through turbid media is complex due to scattering.
  • Dispersion effects in scattering media affect different wavelengths uniquely.
  • Controlling light behavior in such media is crucial for imaging and manipulation.

Purpose of the Study:

  • To demonstrate controlled wavelength-dependent light focusing through turbid media.
  • To leverage wavefront shaping for precise light control in scattering environments.
  • To explore the simultaneous focusing of multiple wavelengths.

Main Methods:

  • Utilizing wavefront shaping techniques.
  • Applying optimized wavefronts to a highly scattering layer.
  • Exploiting the dispersion properties of light scattered by turbid media.
  • Leveraging the linearity of the transmission matrix.

Main Results:

  • Achieved controlled wavelength-dependent light focusing.
  • Demonstrated independent control of light propagation for different wavelengths.
  • Generated foci for various wavelengths by applying tailored wavefronts.
  • Successfully constructed multiple foci with different wavelengths simultaneously.

Conclusions:

  • Wavefront shaping enables precise control over light focusing in turbid media based on wavelength.
  • The dispersion in scattering media can be utilized for wavelength-specific light manipulation.
  • Simultaneous multi-wavelength focusing is feasible, opening new possibilities in optical applications.