J. D. Mills

University of Southampton

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Maskless Fresnel zone plates for dense embedded optical components

Erica Bricchi J. D. Mills Peter G. Kazansky B.G. Klappauf Jeremy J. Baumberg

Summary from only given. When an intense femtosecond laser pulse is tightly focused into a transparent material, high-order nonlinear absorption allows the energy to be deposited predominantly within the focal volume producing a permanent refractive index modification of up to 10/sup -2/ in the bulk of the transparent material. This process allows local patterning inside transparent media into 3D structures, allowing for instance the assembly of many optical components in a single glass block, producing rigid and environmentally tolerant devices. Using this simple technique of direct writing, we are able to write a maskless Fresnel zone plate (radius of 0.997 mm).

Fresnel zone

Fresnel equations

10.1109/cleo.2002.1033454

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A scalable manufacturing process for flexible active-matrix e-paper displays

Journal of the Society for Information Display (2005)

S. E. Burns Kevin Reynolds William Reeves Michael J. Banach Thomas M. Brown

Matrix (chemical analysis)

10.1889/1.2012644

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Citations (53)

3.4: Flexible Active-Matrix Displays

SID Symposium Digest of Technical Papers (2005)

S. E. Burns Kevin Reynolds William Reeves Michael J. Banach Thomas M. Brown

Plastic Logic has developed a process for organic TFT backplane deposition that is fully compatible with low glass transition temperature, inexpensive plastic substrates. We have combined backplanes made with this process with microencapsulated electrophoretic imaging films to make 50 and 100PPI displays that are flexible down to a radius of curvature of 5mm. This process is scalable and is being implemented in a pilot line for substrate sizes up to 350mm × 350mm.

Backplane

Flexible display

Radius of curvature

Deposition

Matrix (chemical analysis)

10.1889/1.2036403

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Citations (14)

Waveguide group velocity determination by spectral interference measurements in near-field optical scanning microscopy

J. D. Mills T. Chaipiboonwong Martin D. B. Charlton M.E. Zoorob M.C. Netti

Measurement of spectral interference with a near-field scanning optical microscope is used to determine directly the variation of group velocity between modes of a planar slab waveguide as the modes propagate along the guide.

Waveguide

Group velocity

Slab

10.1109/cleo.2006.4629069

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Fibre Bragg grating fabrication in germanosilicate fibres with 244nm femtosecond laser light

Pacific International Conference on Applications of Lasers and Optics (2006)

Albert Canagasabey John Canning J. D. Mills D.P. Banks M. Ibsen

The ability to fabricate strong and extraordinarily stable Bragg gratings in any type of fibre using femtosecond laser light has attracted much interest in the recent past. The induced index change has been attributed to glass densification brought about by nonlinear multiphoton ionisation resulting in bond breaking, local melting and rapid cooling occurring after optical breakdown by the high-energy femtosecond light.In this paper, a preliminary comparative study between fibre Bragg grating fabrication in germanosilicate fibre using 244nm femtosecond source with a repetition rate of 250kHz and 200fs pulse duration and a 244nm CW frequency doubled argon-ion source is presented. The reflectivities achieved in both cases were close to identical for similar writing fluences, as were the isochronal annealing profiles. This indicated that despite the very high repetition rate used, the collective heat generated by the femtosecond radiation plays no role in the compaction of the glass matrix. The index change observed in this case is a result of single photon absorption into known defect centres - the laser intensity was insufficient to excite the glass band edge leading to glass compaction. No qualitative difference in index change between CW and short-pulse excitation of these defects is found.

Fiber Bragg Grating

10.2351/1.5056959

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Citations (2)

34.1: Active Matrix Displays Made with Printed Polymer Thin Film Transistors

SID Symposium Digest of Technical Papers (2003)

Henning Sirringhaus S. E. Burns Clemens Kühn K. Jacobs J. D. MacKenzie

Abstract We present a process for active matrix flat panel display manufacture by printing polymer thin film transistors. In this process, transistors are fabricated using soluble semi‐conducting and conducting materials. Accurate definition of the transistor channel and other circuit components is achieved by direct inkjet printing combined with surface energy patterning. We have used this process to create a 4,800 pixel, 50 dpi, active matrix display. This process is in principle environmentally friendly, low temperature, compatible with flexible substrates, cost effective and advantageous for short run length and large display sizes.

Flexible display

Matrix (chemical analysis)

Printed Electronics

Flat panel display

10.1889/1.1832476

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Citations (17)

Ultrashort-Pulse Optically-Assisted Domain Engineering in Lithium Niobate

Ferroelectrics (2006)

Christopher E. Valdivia C.L. Sones S. Mailis J. D. Mills R.W. Eason

Ultrashort laser pulses (∼120–150 fs) of near-ultraviolet (305 nm) to near-infrared (800 nm) wavelengths have been used to optically-assist domain nucleation and growth in lithium niobate. Within illuminated areas, the electric field required for domain nucleation is reduced by up to 41% in undoped and up to 98% in 5-mol% Mg-doped congruently melting materials, allowing direct-writing of inverted domains with electric fields as small as 100 V mm− 1. A first step towards the formation of optically-defined periodically poled lithium niobate was achieved by illumination via a phase mask, demonstrated over small areas with a period of 5.25 microns.

Ultraviolet

10.1080/00150190600888983

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Citations (17)

Photo-induced anisotropy and related phenomena in glass irradiated with ultrashort pulses

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2003)

Peter G. Kazansky J. D. Mills Erica Bricchi Hiroyuki Inouye Jianrong Qiu

New phenomena of anisotropic light scattering, anisotropic Cherenkov third-harmonic generation, photoinduced birefringence and anisotropic reflection from femtosecond direct-write structures are reviewed. The phenomena reveal new mechanism of light-matter interaction.

Reflection

Ultrafast optics

10.1117/12.517315

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39.3: Recent Advances in Printed Active Matrix Displays

SID Symposium Digest of Technical Papers (2004)

S. E. Burns Catherine Ramsdale K. Jacobs J. Watts M. Etchells

Abstract Plastic logic has developed a print based process for active matrix display manufacture. This process has no vacuum or mask steps, is scalable, low cost, low temperature, and environmentally friendly. We report on our recent advances in developing our process for large area electronic paper. This includes scaling our process to print 9″ diagonal thin film transistor backplanes with >100,000 pixels (>QVGA) and printing transistors on commodity flexible plastic substrates.

Backplane

10.1889/1.1825723

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Citations (1)

Numerical simulation ofcontinuum generation ina multimode nonlinear waveguide

T. Chaipiboonwong Péter Horák J. D. Mills S. Brocklesby

Waveguide

Source

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