Digital holographic characterization of liquid microlenses array fabricated in electrode-less configuration

L. Miccio; V. Vespini; S. Grilli; M. Paturzo; A. Finizio; S. De Nicola; P. Ferraro

doi:10.1117/12.828034

17 June 2009 Digital holographic characterization of liquid microlenses array fabricated in electrode-less configuration

L. Miccio, V. Vespini, S. Grilli, M. Paturzo, A. Finizio, S. De Nicola, P. Ferraro

Author Affiliations +

Proceedings Volume 7389, Optical Measurement Systems for Industrial Inspection VI; 73891I (2009) https://doi.org/10.1117/12.828034
Event: SPIE Europe Optical Metrology, 2009, Munich, Germany

Abstract

We show how thin liquid film on polar dielectric substrate can form an array of liquid micro-lenses. The effect is driven by the pyroelectric effect leading to a new concept in electro-wetting (EW). EW is a viable method for actuation of liquids in microfluidic systems and requires the design and fabrication of complex electrodes for suitable actuation of liquids. When compared to conventional electrowetting devices, the pyroelectric effect allowed to have an electrode-less and circuitless configuration. In our case the surface electric charge induced by the thermal stimulus is able to pattern selectively the surface wettability according to geometry of the ferroelectric domains micro-engineered into the lithium niobate crystal. We show that different geometries of liquid microlenses can be obtained showing also a tuneability of the focal lenses down to 1.6 mm. Thousand of liquid microlenses, each with 100 μm diameter, can be formed and actuated. Also different geometries such as hemi-cylindrical and toroidal liquid structures can be easily obtained. By means of a digital holography method, an accurate characterization of the micro-lenses curvature is performed and presented. The preliminary results concerning the imaging capability of the micro-lens array are also reported. Microlens array can find application in medical stereo-endoscopy, imaging, telecommunication and optical data storage too.

Citation Download Citation

L. Miccio, V. Vespini, S. Grilli, M. Paturzo, A. Finizio, S. De Nicola, and P. Ferraro "Digital holographic characterization of liquid microlenses array fabricated in electrode-less configuration", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73891I (17 June 2009); https://doi.org/10.1117/12.828034

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available