High speed multi-level phase devices for active spatial control

Lead Research Organisation: University of Hull
Department Name: Chemistry

Abstract

Liquid crystal (LC) technology has become a dominant force in the displays market. To date, a lot of research and development has been focussed in optimising the LC material properties for displays; however, there are an increasing number of other non-display applications that could benefit from LC technology if it were used to modulate the phase of the light rather than its intensity. Specifically, a dynamic optical element based upon LC technology that can modulate the phase rapidly and with analogue control will be of significant importance in the development of next-generation adaptive optics (AO) for a range of technologies whereby aberration correction and/or dynamic parallelisation are required. Notable advances have already been made using AO in areas such as microscopy, optical tweezing, holographic projection, and laser machining. For example, AO is expanding the capabilities of biomedical microscopy by enabling imaging of biological process in thick and even live tissue specimens, through compensation of aberrations. Such research is now being extended to super-resolution microscopy, which reveals cellular structures an order of magnitude lower than the diffraction limit. AO devices are also used for opto-genetics and photo-activation, where it is necessary to reconfigure 3D light fields at high speeds so that specific cells can be selectively activated. New and improved LC devices would therefore enable a range of research that underpins the life and medical sciences. Equally, adaptive control of ultra-fast lasers for optical nano-fabrication would benefit considerably from new LC technology, allowing pulse shaping and parallelisation at high speeds to be realised, supporting future advances in high-value manufacturing. The potential of using dynamic optical elements, such as LC devices, in all of these applications is well substantiated, but current performance is constrained by the switching speeds and/or phase modulation capabilities of the display-type devices. Increasing device speed will satisfy an as-yet unmet demand from these applications and could enable a greater impact in all of these application areas. Moreover, the development of a new fast-switching SLM with analogue phase control may potentially pave the way to new application spaces that are yet to be realised.

Publications

10 25 50
 
Description the project is formally completed, however the collaborations between the teams is still ongoing. high birefringent materials and mixtures are supplied to the collaborating teams. High dielectric anisotropy materials and mixtures have been supplied in line with the work plan. On the way we have established a much better understanding of the twist bend nematic phase, The collaborating engineering teams have used our materials to design and construct new devices.
Exploitation Route The collaborators in Oxford and Cambridge have constructed new devices and reported this in the literature; currently the work on the project is ongoing funded by other sources. We have provided and reported materials design and design rules which advances the field and can be sued by others.
Sectors Digital/Communication/Information Technologies (including Software)

 
Description costshare exchange grant
Amount £24,000 (GBP)
Funding ID IE161650 
Organisation The Royal Society 
Sector Academic/University
Country United Kingdom
Start 03/2017 
End 03/2019
 
Description felxoelectric materials 
Organisation University of Oxford
Department Department of Engineering Science
Country United Kingdom 
Sector Academic/University 
PI Contribution why provide materials to be investigated on a current research grant
Collaborator Contribution they provide data for materials optimisation
Impact not yet as the project started about 9 months ago
Start Year 2015
 
Description flexoelectric materials 
Organisation University of Cambridge
Department Department of Engineering
Country United Kingdom 
Sector Academic/University 
PI Contribution we provide materials to be investigated in the common project
Collaborator Contribution they provide us with data to optimize materials design
Impact no t yet, the project started 9 months ago
Start Year 2015