TY - JOUR AU - Ott, Peter AU - Shakhs, Mohammed Al AU - Lezec, Henri AU - Chau, Kenneth C2 - Optics Express DA - 2014-12-01 00:12:00 DO - https://doi.org/10.1364/OE.22.029340 LA - en M1 - 22 PB - Optics Express PY - 2014 TI - Flat lens criterion by small-angle phase UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915969 ER -