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Interference and Diffraction02:18

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Coherent perfect absorption mediated anomalous reflection and refraction.

Shourya Dutta-Gupta1, Rahul Deshmukh, Achanta Venu Gopal

  • 1Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland.

Optics Letters
|November 2, 2012
PubMed
Summary

Researchers demonstrate light bending towards the same side of the normal using a corrugated metal film. This effect, achieved through coherent perfect absorption (CPA), redirects light and shows phase sensitivity for unique optical phenomena.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Electromagnetism

Background:

  • Light manipulation typically follows Snell's law, bending light to the opposite side of the normal.
  • Corrugated metal films offer unique electromagnetic responses due to their subwavelength structures.
  • Coherent perfect absorption (CPA) is a phenomenon where incident light is completely absorbed by a system under specific coherent conditions.

Purpose of the Study:

  • To demonstrate and investigate the anomalous bending of light on the same side of the normal.
  • To explore the role of coherent perfect absorption (CPA) in controlling light propagation.
  • To analyze the phase sensitivity of this optical effect in corrugated metal films.

Main Methods:

  • Utilizing a free-standing corrugated metal film.
  • Employing bidirectional illumination to excite the system.
  • Exploiting CPA to suppress the zeroth-order diffraction.
  • Analyzing the resonant behavior of the +1 order with surface modes.

Main Results:

  • Observed bending of light on the same side of the normal, deviating from conventional refraction.
  • Achieved effective back-bending of light into the -1 order by suppressing the specular zeroth order via CPA.
  • Demonstrated that the +1 diffraction order is resonant with the surface mode of the film.
  • Showcased phase sensitivity, leading to simultaneous CPA and superscattering in the same experimental geometry.

Conclusions:

  • The study presents a novel method for anomalous light bending using structured metamaterials.
  • Coherent perfect absorption provides a powerful tool for controlling light redirection and achieving unique scattering phenomena.
  • The phase-sensitive nature of this effect opens possibilities for advanced optical devices and sensors.