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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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

Updated: Jun 2, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Reflective silicon binary diffraction grating for visible wavelengths.

Zhen Peng1, David A Fattal, Andrei Faraon

  • 1Hewlett-Packard Laboratories, 1501 Page Mill Road, Palo Alto, California 94304, USA.

Optics Letters
|April 19, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a flat, reflective grating using subwavelength resonant grating technology. This silicon device efficiently mimics blazed diffraction gratings for visible light applications.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Diffraction gratings are crucial optical components.
  • Traditional blazed gratings can be complex to fabricate.
  • Subwavelength resonant structures offer novel optical functionalities.

Purpose of the Study:

  • To introduce a novel device utilizing subwavelength resonant grating technology.
  • To demonstrate a simplified fabrication method for blazed grating functionality.
  • To show the viability of silicon for visible wavelength resonant devices.

Main Methods:

  • Fabrication of a reflective binary grating using a single lithography step.
  • Utilizing subwavelength resonant grating principles.
  • Characterization of optical performance for visible wavelengths.

Main Results:

  • A single lithography step successfully created a binary grating.
  • The fabricated grating effectively mimics a blazed diffraction grating.
  • Efficient performance of subwavelength resonant devices in the visible spectrum was demonstrated using silicon.

Conclusions:

  • Subwavelength resonant grating technology enables blazed grating functionality in a flat geometry.
  • Silicon is a suitable material for efficient visible wavelength subwavelength resonant devices.
  • This approach offers a simplified fabrication pathway for advanced optical components.