Informal Seminar DQMP - Flatland nano-optics with graphene plasmons

15.06.2017 11:00 – 12:00

Abstract:
Plasmons are charge oscillations coupled to electromagnetic radiation. In graphene plasmons can be confined to extreme subwavelength scales while still having a long lifetime and their wavelength is tunable in situ. Graphene plasmonics is a relatively new research area but has already attracted a lot of attention. This is undoubtedly due to the fact that graphene plasmons are extremely versatile. They are a unique platform for exploring the limits of light matter interaction, two dimensional transformation optics, biosensing, and mid-infrared integrated optics. [1,2] In this seminar I will show how graphene plasmons can be studied using scattering-type scanning near-field optical microscopy (s-SNOM) as well as a technique based on s-SNOM we developed called near-field photocurrent nanoscopy. I will introduce an experiment where we explore the limitations of the graphene plasmon lifetime at room temperature. [3] I will then show an optical phase modulator which is capable of tuning the phase in situ from 0 to 2pi with a footprint of only 350nm. [4] Finally I will introduce a new measurement technique called infrared photocurrent nanoscopy and show how it can be used to detect graphene plasmons electrically from the infrared to the terahertz. [5,6,7]


[1] D.N. Basov et al., Science 354, aag1992 (2016)
[2] T. Low et al., Nature Materials 16, 182-194 (2017)
[3] A. Woessner, M.B. Lundeberg, Y. Gao et al., Nature Materials 14, 421-425 (2015)
[4] A. Woessner, Y. Gao et al., accepted in Nature Photonics (2017)
[5] A. Woessner et al., Nature Communications 7, 10783 (2016)
[6] M.B. Lundeberg et al., Nature Materials 16, 204-207 (2017)
[7] P. Alonso-Gonzalez et al., Nature Nanotechnology 12, 31-35 (2017)

Lieu

Bâtiment: Ecole de Physique

MaNEP room

entrée libre