I just discovered that the optics and photonics professional society SPIE has two open access journals in its SPIE Digital Library. These are as follows:
SPIE Letters (Virtual Journal) – ISSN 1948-7541
Open access from 2005 to the present. Provides access to rapid communications from the six SPIE journals.
SPIE Reviews – E-ISSN: 1946-3251
Review articles dealing with optics and photonics. Open access from 2010 onward.