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HL: Fachverband Halbleiterphysik

HL 95: Novel Functional Materials II

HL 95.4: Invited Talk

Friday, March 11, 2016, 10:45–11:15, H10

Resonant plasmonic nanoantennas for mid-infrared spectroscopy and sensing — •Frank Neubrech and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University Stuttgart, Stuttgart

Plasmonic nanoantennas confine electromagnetic fields at infrared wavelengths to volumes of only a few cubic nanometers, resulting in huge local fields in the vicinity of the resonantly excited metal particles. These near fields are used to enhance the infrared vibrational bands of molecular monolayers and thus enable a spectroscopic detection with ultra-high sensitivity.^[1,2] In the presentation, we will report on fundamental aspects of the vibrational enhancement in surface-enhanced infrared spectroscopy,^[3,4] applications to infrared chemical imaging and sensing in life sciences, such as in-situ protein sensing. Additionally, we will present a combination of the above mentioned concept with a high power and broadband mid infrared laser source to further lower the detection limit in infrared spectroscopy.^[5]
[1] F. Neubrech et al., Phys. Rev. Lett. 101, 157403 (2008).

[2] D. Dregely et al., Nat. Commun. 4, 2237 (2013).

[3] S. Bagheri et al., Adv. Opt. Mater. 11, 1049 (2014).

[4] S. Bagheri et al., ACS Photonics 2, 779 (2015).

[5] T. Steinle et al., Opt. Express 23, 11105 (2015).