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Title: development of holographic optical elements for applications with LED lighting.

Supervisors: Dr Suzanne Martin and Dr Izabela Naydenova

Holography has application in many fields[1]  and researchers at the Industrial and Engineering Optics Centre at Dublin Institute of Technology have developed a number of photopolymer formulations for recording holograms and holographic devices without post processing. This means that the photosensitive material is self-developing, the image or the appropriate refractive index profile for the device appears immediately when the layer is exposed to laser light [2],[3],[4] .

A range of diffractive elements can be recorded holographically in such materials so that they focus or split or combine beams of light, performing the functions of bulky refractive optics but having the advantage of being lightweight, thin and multifunctional. Combinations of elements can be made by multiplexing and combining elements.  

Recent research at IEO has successfully produced elements  that focus light to a spot from a broad range of angles using low spatial frequencies and low layer thickness[5] . Current work is aiming to improve performance by combining optical elements. With the  LED lighting market growing rapidly and more companies emerging in specialist LED applications,  holographic elements that can focus, split or re-direct beams of light will have great potential in LED applications. This project would aim to develop Holographic Optical Elements (HOEs) for use in LED lighting, testing the potential of the photopolymer for use with LEDs, combining HOEs in order to tailor the spectral range of the light and adapting production processes to suit this application.

[1] V Toal “Introduction to holography” 2011 Taylor and Francis,

[2] Martin S, Feely CA and Toal V  “Holographic recording characteristics of an acrylamide-based photopolymer” Applied Optics 36 (23)  5757-5768 (1997)

[3]Leite E, Naydenova I, Mintova S, Leclercq L, Toal V, “Photopolymerisable Nanocomposites for Holographic Recording and Sensor Application” Appl. Opt.49(19)  3652-3660 ( 2010)

[4] Naydenova I, Jallapuram R, Toal V, Martin S,  “Characterisation of the humidity and temperature responses of a reflection hologram recorded in acrylamide-based photopolymer” Sensors Actuat. B-Chem 139(1)  35-38.  (2009)

[5] Hoda Akbari, Izabela Naydenova, Suzanne Martin “Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications” Applied Optics 53(7): 1343-53 (2014)