Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2015 Jun 2;6:7044. doi: 10.1038/ncomms8044

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

PMC Copyright notice

The graph shows two HC generation regimes, for intraband (s–s) and interband (d–s) transitions induced by SPPs with energy E_p<E_int or E_p>E_int, respectively. The regime with E_p<E_int offers a trade-off between optimal HC generation, moderate HC energies up to ∼2 eV, and longer MFPs and relaxation times than the interband regime. The dashed line indicates the Fermi energy.