SPIE Reviews began publication in January 2010. SPIE Reviews is a peer-reviewed, open-access, online journal that publishes invited review articles covering the state of the art of emerging and rapidly evolving optics and photonics technologies and their applications. The journal also features links to review articles published in other SPIE journals on the SPIE Digital Library. All articles and supplemental materials in SPIE Reviews are open access and freely available to all. Visit the SPIE Digital Library to access the journal.