Nanoantenna-assisted plasmonic enhancement of IR absorption of vibrational modes of organic molecules

Alexander G Milekhin; Olga Cherkasova; Sergei A Kuznetsov; Ilya A Milekhin; Ekatherina E Rodyakina; Alexander V Latyshev; Sreetama Banerjee; Georgeta Salvan; Dietrich R T Zahn

doi:10.3762/bjnano.8.99

Nanoantenna-assisted plasmonic enhancement of IR absorption of vibrational modes of organic molecules

Beilstein J Nanotechnol. 2017 May 3:8:975-981. doi: 10.3762/bjnano.8.99. eCollection 2017.

Authors

Alexander G Milekhin^{1

2}, Olga Cherkasova^{2

3}, Sergei A Kuznetsov^{2

4}, Ilya A Milekhin^{1

2}, Ekatherina E Rodyakina^{1

2}, Alexander V Latyshev^{1

2}, Sreetama Banerjee⁵, Georgeta Salvan⁵, Dietrich R T Zahn⁵

Affiliations

¹ A.V. Rzhanov Institute of Semiconductor Physics, Novosibirsk, 630090, Russia.
² Novosibirsk State University, Novosibirsk, 630090, Russia.
³ Institute of Laser Physics of SB RAS, Novosibirsk, 630090, Russia.
⁴ A.V. Rzhanov Institute of Semiconductor Physics RAS, Novosibirsk Branch "TDIAM", Lavrentiev Ave. 2/1, Novosibirsk, 630090, Russia.
⁵ Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany.

Abstract

Nanoantenna-assisted plasmonic enhancement of IR absorption and Raman scattering was employed for studying the vibrational modes in organic molecules. Ultrathin cobalt phthalocyanine films (3 nm) were deposited on Au nanoantenna arrays with specified structural parameters. The deposited organic films reveal the enhancement of both Raman scattering and IR absorption vibrational modes. To extend the possibility of implementing surface-enhanced infrared absorption (SEIRA) for biological applications, the detection and analysis of the steroid hormone cortisol was demonstrated.

Keywords: Raman scattering; cobalt phthalocyanine; cortisol; localized surface plasmon resonance; metal nanoantennas; surface-enhanced infrared absorption (SEIRA).