Abstract-Terahertz Metamaterials with Ultrahigh Angular Sensitivity

1. Norman Born^1,*, 
2. Ibraheem Al-Naib²,
3. Christian Jansen¹, 
4. Ranjan Singh³,
5. Jerome V. Moloney⁴, 
6. Maik Scheller⁴and
7. Martin Koch¹

Article first published online: 21 JAN 2015

DOI: 10.1002/adom.201400469

http://onlinelibrary.wiley.com/doi/10.1002/adom.201400469/abstract;jsessionid=20A4686B394E1E6BCBE1CF340A446441.f03t02?deniedAccessCustomisedMessage=&userIsAuthenticated=false

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

A novel conceptual design methodology for strongly interacting metamaterials allows an ultrahigh angular sensitivity. Among others, this methodology enables precise sensing of the wave vector or the exclusion of unwanted directional radiation components. By diligently tailoring the dimensions of the primitive unit cell, an orders of magnitude enhanced sensitivity is achieved.

Abstract-Terahertz beam focusing based on plasmonic waveguide scattering

Yasuaki Monnai¹, Kristian Altmann², Christian Jansen², Martin Koch², Hartmut Hillmer³, and Hiroyuki Shinoda¹

¹Department of Information Physics and Computing, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
²Department of Physics, Philipps University of Marburg, Renthof 5, 35032 Marburg, Germany
³Institute of Nanostructure Technologies and Analytics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

http://apl.aip.org/resource/1/applab/v101/i15/p151116_s1

We demonstrate free-space focusing of terahertz (THz) radiation by scattering plasmonic surface-waves into the air. We use a grating of shallow holes which contains non-equidistant defects which act as scattering centers. The scattering occurs with defined phase delays such that the waves emitted in free-space interfere constructively to form a focus above the waveguide surface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.

© 2012 American Institute of Physics