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Metrology for Functional Nanosystems

Profile

The research group „Metrology for Functional Nanosystems“ is located at the LENA Laboratory for Emerging Nanomtrelogy“ at the interface between the Physikalisch-Technische Bundesanstalt (PTB) and the Braunschweig University of Technology (TU Braunschweig). The group supports the joint research activties of both institutions in the field of nanometrology and aims for the development and verification of novel nanooptical systems for metrological or sensoric applications as well as the investigation of metrological relevant light-matter interaction processes in nanoscale systems.

Click here for the LENA-webseit of the research group Opens external link in new window.

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Research

Research interests

  • Micro- and nanooptic
  • Optical metasurfaces
  • Light-Matter-Interactions in nanostructured surfaces
  • Fundamental noise processes in optomechanical systems
  • High-resolution metrology
  • Gravitational-wave astronomy
  • Microstructure Technology

Projects

  • PolEx - UV-polarizers based on exciton generation in dielectric materials (DFG-Research Grant)
  • NanoMet- Metrology for Complex Nanosystems (DFG-Graduiertenkolleg)

Cooperations

IGSM Braunschweig

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Courses

Sommer term courses 2017

"Gravitational waves and its detection" Opens external link in new window(Info)

Lecture       Thursday        13:15 - 14:45   MS 3.3

"Physics II for pharmacists,  food chemists, theachers"Opens external link in new window (Info)

Lecture       Thursday        08:00 - 09:30   MS 3.1

Exercise      Monday          11:15 - 12:00   MS 3.1

Winter term courses 2016/2017

"Fundamentals of Nanooptic" (Info)

Introduction lectures + Blockcourse/Seminar

"Physics I for pharmacists,  food chemists, theachers" (Info)

Lecture       Tuesday          11:30 - 13:00   MS 1.2

Exercise      Thuersday      12:00 - 12:45   MS 1.2

Sommer term courses 2016

„Gravitational waves and its detection“

Exercise       Tuesday            9:30 - 11:00   

Lecture         Thuersday      13:45 - 14:45

Exercise       Thuersday      15:00 - 16:30  

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Publications

Recent

 

Materials Pushing the Application Limits of Wire Grid Polarizers further into the Deep Ultraviolet Spectral Range

T. Siefke, S. Kroker, K. Pfeiffer, O. Puffky, K. Dietrich, D. Franta, I. Ohlídal, A. Szeghalmi, E.-B. Kley, and A. Tünnermann

Opens external link in new windowAdvanced Optical Materials (2016), doi: 10.1002/adom.201600250

Frei verfügbar unter Opens external link in new windowhttps://arxiv.org/ftp/arxiv/papers/1607/1607.04866.pdf

Wire grid polarizers (WGPs), periodic nano-optical metasurfaces, are convenient polarizing elements for many optical applications. However, they are still inadequate in the deep ultraviolet spectral range. It is shown that to achieve high performance ultraviolet WGPs a material with large absolute value of the complex permittivity and extinction coefficient at the wavelength of interest has to be utilized. This requirement is compared to refractive index models considering intraband and interband absorption processes. It is elucidated why the extinction ratio of metallic WGPs intrinsically humble in the deep ultraviolet, whereas wide bandgap semiconductors are superior material candidates in this spectral range. To demonstrate this, the design, fabrication, and optical characterization of a titanium dioxide WGP are presented. At a wavelength of 193 nm an unprecedented extinction ratio of 384 and a transmittance of 10% is achieved.

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