RESEARCH

 

Resonant nanoparticles and their assemblies can show complex and often surprising interactions with light, giving rise to phenomena such as "magnetic light", directional scattering, Fano resonances, and strong near-field enhancements. Using the capabilities of modern nanotechnology, these interactions can be tailored by the size, shape, material composition, and arrangement of the nanoparticles. As such, resonant nanoparticle structures are a versatile research platform for investigating fundamental light-matter interactions and nanoscale coupling phenomena. Furthermore, they provide unique optical functionalities opening new opportunities for applications like next-generation (quantum) light sources, optical communications, and truly flat optical components. In our research we combine top-down and bottom-up nanofabrication approaches to experimentally realize composite photonic systems able to control the emission, propagation, and absorption of light and all of its properties at the nanoscale.

Research_picture_Staude_2_web490

Research topics include:

  • Nanophotonics
  • Nanoplasmonic
  • Nanoantennas
  • High-Index Dielectric Nanoparticles
  • Hybrid Quantum Systems
  • Quantum Emitters
  • Nanofabrication
  • Subwavelength Optics
  • Metamaterials
  • Photonic Crystals

Nanotechnology and optical characterization techniques include:

  • Electron-beam lithography based nanofabrication
  • Linear and nonlinear optical spectroscopy
  • Time-resolved photoluminescence spectroscopy
  • Back focal plane imaging
  • Assembly of hybrid nanostructures by dry transfer
  • Assembly of hybrid quantum systems by selective surface functionalization

Recently, we have focused on nanoparticles composed of highly transparent, high-refractive-index dielectrics. Such nanoparticles support localized electric and magnetic Mie-type resonances (see image), thereby providing a low-loss alternative to plasmonic nanostructures [1]. Most prominently, highly efficient functional nanosurfaces [2], e.g., for resonant wavefront shaping [3], nonlinear frequency generation [4], and spectral filtering [5] can be created by dedicated arrangements of designed dielectric nanoresonators in a plane. Active tuneability of dielectric nanosurfaces has been achieved using liquid crystals [6]. Furthermore, we have studied the use of Mie-resonant all-dielectric nanoparticles as high-radiation efficiency nanoantennas for spontaneous emission control [1,7].

[1] I. Staude et al., ACS Nano 7, 7824-7832 (2013).
[2] M. Decker et al., Adv. Opt. Mater. 3, 813−820 (2015).
[3] K. E. Chong et al., Nano Lett. 15, 5369-5374 (2015).
[4] M. R. Shcherbakov et al., Nano Lett. 14, 6488−6492 (2014).
[5] K. E. Chong et al., Small 10, 1985-1990 (2014).
[6] J. Sautter et al., ACS Nano 9, 4308-4315 (2015).
[7] I. Staude et al., ACS Photonics 2, 172-177 (2015).

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