Liquid Lens Lab

Project - Can we create a tunable asphere with a liquid lens?

Description

Can we create a tunable asphere with a liquid lens?


Objective

Electrowetting liquid lenses are a convenient tool to realise tunable optics without any moving parts. We focus on the question whether it is possible to extend the functionality from a spherical lens to more general optical surfaces by using the very same hardware, but operating it in a smarter way.


Impact

Since the earliest telescope has been patented by Hans Lippershey in the Netherlands in 1608, optical designers always combined lenses of different optical power to manufacture complex optical instruments. Until recently the optical properties of these glass/plastic lenses had been fixed, however a new technology is arising: the liquid lens.

A single optical component, that can change its optical properties by changing its shape. The most common technique is based on electrowetting. Manipulating the shape of a liquid droplet by changing its surface tension electrically is called electrowetting.

(insert this youtube video from Philips here: https://www.youtube.com/watch?v=JAZ3pJkgreI )

A lens with a tunable focal length is created. A lens that operates independently of gravity effects. A lens that can withstand many more operating cycles than a classical lens system, where lenses have to be moved mechanically to achieve the same effect. While liquid lenses are busy conquering markets like bar code scanners, ophthalmology, and autofocusing systems, research focusses on increasing the flexibility of the produced optical surfaces.

We study a new way to create optical surfaces by using the disadvantages of the used liquids. They cannot follow infinitely fast changes of the control voltage. Just like on any other liquid surface, waves are created, waves that have been considered to be the source of aberrations. While the industrial manufactures have been trying to suppress these waves, we try to stimulate them to create new controlled surface shapes.

The natural wave mode on a cylindrical liquid lens is a Bessel function. Bessel functions have one awesome property, their orthogonality. In other words, if you can create and scale Bessel waves on the liquid lens surface, you can create any surface shape by simply adding them up. And this is what this is all about: Studying whether this works and where the limitations of this technique are.

The Bessel modes have already been identified here:

Matthias Strauch, Yifeng Shao, Florian Bociort, and H. Paul Urbach, Study of surface modes on a vibrating electrowetting liquid lens, Applied Physics Letters, 111, 2017, https://doi.org/10.1063/1.4999562

And there is more to come: zernike polynomials, axicons, top hats, ptychographic measurements with the liquid lens, …


Publicaties bij dit project

Hier komen de publicaties die horen bij dit project

Keywords

Projects.

View all on the projectspage.

Wavefront coding in barcode imaging system

For simplicity, it is often assumed that the imaging system consists of a single thin lens. In the case of the barcode reader, the imaging system consists of several thick lenses and ...

project

Wavefront coding in barcode imaging system

New methods and applications of Ptychography

Ptychography is a scanning Coherent Diffraction Imaging (CDI) method for reconstructing a complex valued object function from intensity measurements recorded in the Fraunhofer or Fresnel diffraction region. The technique provides a solution ...

project

New methods and applications of Ptychography

Graded Index optics

Recent progress in the making of media with a variable refractive index has the potential to change lens design significantly. With these new materials, curved light rays are used to make high-quality ...

project

Graded Index optics

LINX

LINX is a NWO-TTW perspective programme with the aim to apply various lensless imaging techniques, from ptychography to scatterometry, while using wavelengths in the EUV and Soft X-Ray regime. This programme is ...

project

LINX

Phase Retrieval

The phase of a field is often more important than the amplitude. This is in particular true for focusing of light. To improve the quality of imaging it is often desirable to consider ...

project

Phase Retrieval

News.

Related to the topic at hand.

SLIM funding for TUD, The Hague University of Applied Sciences, LIS and TNO for the Bedrijfsschool Optica

The Dutch Optics Centre (DOC) has acquired funding in the SLIM framework of the Ministery of Social Affairs for starting the Bedrijfschool Optica. The Bedrijfsschool Optica will offer tailored education and training ...

News - October 15, 2020

SLIM funding for TUD, The Hague University of Applied Sciences, LIS and TNO for the Bedrijfsschool Optica

Soft X-Ray source based on HHG for LINX project

The Optics Research Group recently installed a coherent Soft X-Ray source based on High Harmonic Generation. This new source will have an important role within the LINX consortium, where innovative techniques for ...

News - October 15, 2020

Soft X-Ray source based on HHG for LINX project

The Photonic Career Hub – CARLA

Photonics has been coined as a key enabling technology for the future. It is the physical science that focusses on all aspects of light – not only the visible light - and ...

News - July 2, 2020

The Photonic Career Hub – CARLA

Beijing Institute of Space Mechanics and Electricity

A delegation of  50 people from BISME (Bejing Institute of Space Mechanics and Electricity) has visited the Optics Group. The delegation was in  the Netherlands to attend the 6th International Symposium ...

News - October 7, 2019

Beijing Institute of Space Mechanics and Electricity

Weekend of Science – Oct 5-6, 2019

The Weekend of Science is a national science weekend. Every year, various technical institutions open their doors to provide extra activities. This year the theme of our Weekend of Science is: LIGHT. Date ...

News - September 25, 2019

Weekend of Science – Oct 5-6, 2019

Face2Phase – Oct 21-23, 2019

The conference Fase2Phase, 2nd Edition, addresses imaging with phase information and covers topics such as lensless imaging, aberration retrieval, adaptive and active optics, ptychography, holography, tomography, phase retrieval and applications. Date : 21 ...

News - September 10, 2019

Face2Phase – Oct 21-23, 2019