Time- and frequency-resolved electrodynamics of germanium nanoantennas for mid-infrared plasmonics (Orale)

Michele Ortolani (1) , Marco Fischer (2) , Leonetta Baldassarre (3) , Antonio Samarelli (4) , Kevin Gallacher (4) , Jacopo Frigerio (5) , Valeria Giliberti (1) , Emilie Sakat (6, 7) , Christian Schmidt (2) , Alfred Leitenstorfer (2) , Brida Daniele (2) , Giovanni Isella (5) , Douglas J Paul (4) , Paolo Biagioni (7)

1 Dipartimento di Fisica [Roma La Sapienza]
2 Department of Physics and Center for Applied Photonics
3 Sapienza@IIT Laboratory - Center for Life Nano Science [Genova]
4 James Watt School of Engineering [Univ Glasgow]
5 Politecn Milan, LNESS Dipartimento Fis, I-22100 Como, Italy
6 Laboratoire Charles Fabry / Naphel
7 INFM-Dipartimento di Fisica-Politecnico di Milano

We investigate the mid-infrared response of heavily doped germanium films and periodic arrays of nanoantennas by both continuous wave transmission/reflection spectroscopy and ultrafast pump-probe spectroscopy. We compare the data to finite-element modeling electromagnetic simulations of the subwavelength nanostructures. The plasma frequency of the doped or optically activated semiconductor extends in the 1000-2000 cm-1 range thus enabling access to molecular fingerprints.

Domains: Physics [physics]; Physics [physics]; Optics [physics.optics]

Michele Ortolani, Marco Fischer, Leonetta Baldassarre, Antonio Samarelli, Kevin Gallacher, et al.. Time- and frequency-resolved electrodynamics of germanium nanoantennas for mid-infrared plasmonics (Orale). 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), Aug 2015, Hong Kong, China. pp.1-2, ⟨10.1109/IRMMW-THz.2015.7327717⟩. ⟨hal-01713327⟩