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Southampton, United Kingdom

Zhu W.,Nanyang Technological University | Song Q.,University Paris Est Creteil | Yan L.,Nanyang Technological University | Zhang W.,Nanyang Technological University | And 15 more authors.
Advanced Materials

The first demonstration of an optofluidic metamaterial is reported where resonant properties of every individual metamolecule can be continuously tuned at will using a microfluidic system. This is called a random-access reconfigurable metamaterial, which is used to provide the first demonstration of a tunable flat lens with wavefront-reshaping capabilities. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Zhu W.M.,Nanyang Technological University | Liu A.Q.,Nanyang Technological University | Liu A.Q.,Institute of Microelectronics, Singapore | Bourouina T.,University Paris Est Creteil | And 8 more authors.
Nature Communications

Dichroic polarizers and waveplates exploiting anisotropic materials have vast applications in displays and numerous optical components, such as filters, beamsplitters and isolators. Artificial anisotropic media were recently suggested for the realization of negative refraction, cloaking, hyperlenses, and controlling luminescence. However, extending these applications into the terahertz domain is hampered by a lack of natural anisotropic media, while artificial metamaterials offer a strong engineered anisotropic response. Here we demonstrate a terahertz metamaterial with anisotropy tunable from positive to negative values. It is based on the Maltese-cross pattern, where anisotropy is induced by breaking the four-fold symmetry of the cross by displacing one of its beams. The symmetry breaking permits the excitation of a Fano mode active for one of the polarization eigenstates controlled by actuators using microelectromechanical systems. The metamaterial offers new opportunities for the development of terahertz variable waveplates, tunable filters and polarimetry. © 2012 Macmillan Publishers Limited. Source

Mills B.,Optoelectronics Research Center | Feinaeugle M.,Optoelectronics Research Center | Sones C.L.,Optoelectronics Research Center | Rizvi N.,Laser Micromachining Ltd | Eason R.W.,Optoelectronics Research Center
Journal of Micromechanics and Microengineering

Commercial digital multimirror devices offer a cheap and effective alternative to more expensive spatial light modulators for ablation via beam shaping. Here we present femtosecond laser ablation using the digital multimirror device from an Acer C20 Pico Digital Light Projector and show ablation of complex features with feature sizes ranging from sub-wavelength (400 nm) up to ∼30 ̈m. Simulations are presented that have been used to optimize and understand the experimentally observed resolution. © 2013 IOP Publishing Ltd. Source

Brocklesby W.S.,Optoelectronics Research Center | Nilsson J.,Optoelectronics Research Center | Schreiber T.,Fraunhofer Institute for Applied Optics and Precision Engineering | Limpert J.,Fraunhofer Institute for Applied Optics and Precision Engineering | And 8 more authors.
European Physical Journal: Special Topics

The application of petawatt lasers to scientific and technological problems is advancing rapidly. The usefulness of these applications will depend on being able to produce petawatt pulses at much higher repetition rates than is presently possible. The International Coherent Amplification Network (ICAN) consortium seeks to design high repetition rate petawatt lasers using large scale coherent beam combination of femtosecond pulse amplifiers built from optical fibres. This combination of technologies has the potential to overcome many of the hurdles to high energy, high average power pulsed lasers, opening up applications and meeting societal challenges. © 2014 EDP Sciences and Springer. Source

Ou J.Y.,Optoelectronics Research Center | Plum E.,Optoelectronics Research Center | Jiang L.,University of Southampton | Zheludev N.I.,Optoelectronics Research Center
Nano Letters

We introduce mechanically reconfigurable photonic metamaterials (RPMs) as a flexible platform for realizing metamaterial devices with reversible and large-range tunable characteristics in the optical part of the spectrum. Here we illustrate this concept for a temperature-driven RPM exhibiting reversible relative transmission changes of up to 50%. © 2011 American Chemical Society. Source

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