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
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
Emilie Sakat
- Function : Author
- PersonId : 17770
- IdHAL : emilie-sakat
- ORCID : 0000-0001-5392-2576
- IdRef : 175628343
Christian Schmidt
- Function : Author
- PersonId : 937354
Paolo Biagioni
- Function : Author
- PersonId : 785931
- ORCID : 0000-0003-4272-7040
Abstract
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.