PMID- 26696143 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20160413 LR - 20181023 IS - 1539-4794 (Electronic) IS - 0146-9592 (Linking) VI - 41 IP - 1 DP - 2016 Jan 1 TI - Solid electrically tunable dual-focus lens using freeform surfaces and microelectro-mechanical-systems actuator. PG - 1-4 LID - 10.1364/OL.41.000001 [doi] AB - In this Letter, a miniature solid tunable dual-focus (DF) lens, which is designed using freeform optical surfaces and driven by one microelectro-mechanical-systems rotary actuator, is reported. Such a lens consists of two optical elements, each having a flat surface and one freeform surface optimized by ray-tracing technology. By changing the relative rotation angle of the two lens elements, the lens configuration can form double foci with corresponding focal lengths varied simultaneously, resulting in a tunable DF effect. Results show that one of the focal lengths is tuned from about 30 to 20 mm, while the other one is varied from about 30 to 60 mm, with a maximum rotation angle of about 8.2 deg. FAU - Zou, Yongchao AU - Zou Y FAU - Zhang, Wei AU - Zhang W FAU - Chau, Fook Siong AU - Chau FS FAU - Zhou, Guangya AU - Zhou G LA - eng PT - Journal Article PL - United States TA - Opt Lett JT - Optics letters JID - 7708433 EDAT- 2015/12/24 06:00 MHDA- 2015/12/24 06:01 CRDT- 2015/12/24 06:00 PHST- 2015/12/24 06:00 [entrez] PHST- 2015/12/24 06:00 [pubmed] PHST- 2015/12/24 06:01 [medline] AID - 333682 [pii] AID - 10.1364/OL.41.000001 [doi] PST - ppublish SO - Opt Lett. 2016 Jan 1;41(1):1-4. doi: 10.1364/OL.41.000001.