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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


  • EMPIR "Photonic and optomechanical sensors for nanoscaled and quantum thermometry"
  • EMPIR "Advancing optical metrology beyond the current limits"
  • Research training group "NanoMet – Metrology for complex nanosystems"
  • Research project "PolEx - UV-polarizers based on exciton generation in dielectric materials for wavelengths from 150 to 250 nm"

[Translate to English:] Kooperationen


The group has collaborations to institutions in more than 15 different countries.



Monash University, Melbourne, Australia

LNE, Paris, France

Dutch Metrology Institute, VSL, Delft, Netherlands

National Synchrotron Radiation Laborytory, University of Science and Technology of China, Hefei, China

Laboratoire Kastler-Brossel, Sorbonne, Paris, France

Technical University of Delft, Netherlands

Masayk University, Brno, Czech Republic

KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary

Astronomical Observatory, University of Warsaw, Warszawa, Poland

Technical University of Denmark, DTU, Kopenhagen, Denmark

Gran Sasso Science Institute, L'Aquila, Italy

Moscow State University, Russia

VTT MIKES Metrology, Espoo, Finland

Università di Roma Tor Vergata, Roma, Italy

MIND-IN2UB, Department of Engineering: Electronics, University of Barcelona, Spain

University of Aalto, Finland

Università degli Studi di Urbino ‘Carlo Bo’, Urbino, Italy

Centro Español de Metrologia, Madrid, CEM, Spain

Laboratoire des Matériaux Avancés (LMA), Lyon, France

Istituto Nazionale di Ricerca Metrologica, Torino, Italy

Swansea University, United Kingdom

Université Claude Bernard Lyon, France

Università di Torino, Italy

Columbia State University, USA

Université de Lyon; Institut des Nanotechnologies de Lyon CNRS, INSA de Lyon, France

Department of Physics, Tokyo Institute of Technology, Tokyo, Japan

Crystalline Mirror Solutions, USA





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Winter term courses 2018/2019

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

Lecture       Thursday        13:15 - 14:45   MS 3.3

Summer term courses 2018

"Fundamentals of Nanooptic" Opens external link in new window(Info)

Lecture       Thursday        13:15 - 14:45   MS 3.3

Winter term courses 2017/2018

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

Lecture       Thursday        13:15 - 14:45   MS 3.3

Summer 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

Summer 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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Thermal noise in complex systems

R. Glaser, L. Maczewsky, M. Mäusezahl, R. Nawrodt, J. Dickmann, S. Kroker, T. Knupfer and G.D. Cole

Opens external link in new windowhttps://pos.sissa.it/325/010/pdf

We present a method to calculate the power spectral density of Brownian noise in complex op-tomechanical systems using Levin’s approach of virtual pressure and present first mechanical lossmeasurements for high-purity GaAs over a wide temperature range from 7 K to 250 K. The lossreveals three Debye loss peaks.  Each peak corresponds to an Arrhenius-like relaxation processwith activation energies of 17.9 meV, 65.4 meV and 123 meV respectively.  Additional light in-duced damping was observed for photon energies below and above the fundamental gap of GaAsin contrast to observations by Okamotoet al.

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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