Capturing the Optical Phase Response of Nanoantennas by Coherent Second-Harmonic Microscopy

• Published in: Nano letters Vol. 14; no. 7; pp. 4078 - 4082
• Main Authors: Accanto, Nicolò, Piatkowski, Lukasz, Renger, Jan, van Hulst, Niek F
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 09.07.2014
• Subjects: Applied sciences; Broadband; Coherence; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronics; Exact sciences and technology; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties; Microscopy; Molecular electronics, nanoelectronics; Nanostructure; Physics; Plasmonics; Plasmons; Second harmonic generation; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Spectra; Surface and interface electron states; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); phase control; second harmonic generation; nonlinear microscopy; Nanoantenna; MIIPS; Nanostructure; Resonance; Plasmon; Second harmonic; Nanoelectronics
• ISSN: 1530-6984; 1530-6992; 1530-6992
• DOI: 10.1021/nl501588r

The ultrafast coherent control of light localization in resonant plasmonic nanostructures is intricately related to the phase response of the involved plasmon resonances. In this work, we exploit the second harmonic signal generated by single optical nanoantennas subject to broadband phase-controlled femtosecond pulses to study and tailor the coherent resonance response. Our results reveal that both the spectral phase and the amplitude components associated with the plasmon resonance of arbitrary individual nanoantennas can be accurately determined.