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Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
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Squeezing and expanding light without reflections via transformation optics.

C García-Meca1, M M Tung, J V Galán

  • 1Valencia Nanophotonics Technology Center, Universidad Politécnica de Valencia, 46022 Valencia, Spain. cargarm2@ntc.upv.es

Optics Express
|March 4, 2011
PubMed
Summary

Researchers developed reflectionless squeezing devices using transformation optics, enabling novel applications like perfect couplers and flat hyperlenses. This breakthrough eliminates unwanted reflections in optical systems.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Transformation Optics

Background:

  • Transformation optics enables novel electromagnetic devices.
  • Squeezing devices are crucial for manipulating light.
  • Minimizing reflections is a key challenge in optical system design.

Purpose of the Study:

  • To analytically derive the reflection coefficient for generic 3D squeezing devices.
  • To identify conditions for creating reflectionless squeezing devices.
  • To explore applications of reflectionless squeezers.

Main Methods:

  • Derivation of an analytical expression for the angle-dependent reflection coefficient.
  • Analysis of conditions for zero reflection.
  • Application of impedance matching for antireflective coatings.
  • Utilizing quasi-conformal mapping for material implementation.

Main Results:

  • Identified conditions for reflectionless transformation-optics-based squeezers.
  • Demonstrated that antireflective coating design simplifies to dielectric impedance matching.
  • Proposed applications including ultra-short perfect couplers and flat reflectionless hyperlenses.
  • Extended theory to coupling metallic waveguides with different cross-sections.

Conclusions:

  • Reflectionless squeezing devices are achievable using transformation optics.
  • These devices offer significant potential for advanced photonic applications.
  • Implementation is possible using non-magnetic isotropic materials.