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Metrology for Functional Nanosystems


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 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


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


IGSM Braunschweig

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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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Brownian thermal noise in functional optical surfaces

S. Kroker, J. Dickmann, C. B. Rojas Hurtado, D. Heinert, R. Nawrodt, Y. Levin, and S. P. Vyatchanin

Opens external link in new windowhttps://journals.aps.org/prd/abstract/10.1103/PhysRevD.96.022002

We present a formalism to compute Brownian thermal noise in functional optical surfaces such as grating reflectors, photonic crystal slabs, or complex metamaterials. Such computations are based on a specific readout variable, typically a surface integral of a dielectric interface displacement weighed by a form factor. This paper shows how to relate this form factor to Maxwell’s stress tensor computed on all interfaces of the moving surface. As an example, we examine Brownian thermal noise in monolithic T-shaped grating reflectors. The previous computations by Heinert et al. [Phys. Rev. D 88, 042001 (2013)] utilizing a simplified readout form factor produced estimates of thermal noise that are tens of percent higher than those of the exact analysis in the present paper. The relation between the form factor and Maxwell’s stress tensor implies a close correlation between the optical properties of functional optical surfaces and thermal noise.

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