Abstract

We use a quantum mechanical approach to derive a set of linear and nonlinear quantum conductivity coefficients for metal–insulator–metal structures with nanometer sized gaps. The immediate proximity of metallic objects generates a tunneling AC current density that endows the gap region with additional linear and nonlinear coefficients that in turn trigger linear and nonlinear absorption, and second- and third-harmonic generation. For example, a vacuum gap approximately 0.8 nm thick displays an effective |χ(2)|0.1pm/V for adjacent objects composed of dissimilar metals and an effective |χ(3)|1020m2/V2 for either similar or dissimilar metals, increasing exponentially for smaller gaps. Field localization inside the gap ensures that harmonic generation arising from the gap region overwhelms intrinsic metal second- and third-order nonlinearities.

© 2014 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Quantum conductivity for metal–insulator–metal nanostructures

Joseph W. Haus, Domenico de Ceglia, Maria Antonietta Vincenti, and Michael Scalora
J. Opt. Soc. Am. B 31(2) 259-269 (2014)

Quantum effects in the optical response of extended plasmonic gaps: validation of the quantum corrected model in core-shell nanomatryushkas

Mario Zapata, Ángela S. Camacho Beltrán, Andrei G. Borisov, and Javier Aizpurua
Opt. Express 23(6) 8134-8149 (2015)

Clarifying the origin of third-harmonic generation from film-coupled nanostripes

Xiaojun Liu, Stéphane Larouche, Patrick Bowen, and David R. Smith
Opt. Express 23(15) 19565-19574 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription