A Carpet Cloak for Visible Light

Abstract

We report an invisibility carpet cloak device, which is capable of making an object undetectable by visible light. The cloak is designed using quasi conformal mapping and is fabricated in a silicon nitride waveguide on a specially developed nanoporous silicon oxide substrate with a very low refractive index (n is less than 1.25). The spatial index variation is realized by etching holes of various sizes in the nitride layer at deep subwavelength scale creating a local effective medium index. The fabricated device demonstrates wideband invisibility throughout the visible spectrum with low loss. This silicon nitride on low index substrate can also be a general scheme for implementation of transformation optical devices at visible frequencies.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2011
Accession Number
ADA555883

Entities

People

  • Christopher Gladden
  • Jason Valentine
  • Majid Gharghi
  • Thomas Zentgraf
  • Xiang Zhang
  • Xiaobo Yin
  • Yongmin Liu

Organizations

  • University of California, Berkeley

Tags

DTIC Thesaurus Topics

  • Ceramic Materials
  • Charge Coupled Devices
  • Conformal Mapping
  • Engineering
  • Fabrication
  • Frequency
  • Materials
  • Materials Science
  • Metamaterials
  • Optics
  • Refractive Index
  • Scattering
  • Spectra
  • Tunable Metamaterials
  • Two Dimensional
  • Visible Spectra
  • Waveplates

Fields of Study

  • Physics

Readers

  • Nanofabrication and Microfabrication.
  • Spectroscopy.