Organometallic perovskite metasurfaces

B. Gholipour, G. Adamo, D. Cortecchia, H. N. S. Krishnamoorthy, M. D. Birowosuto, N. I. Zheludev, C. Soci  Advanced Materials,  issue 9 (2017)

 
 
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Current interests lie in the area of reconfigurable free-space and integrated nanophotonic devices using stoichiometrically engineered phase-change, photoionic, plasmonic, epsilon-near-zero and topological insulator semiconductors as well as multimaterial optical fibers including soft glass and metal cored fibers for emerging  telecommunication, sensing, data storage, energy, solid state display and neuromorphic computing applications. Other activities include use of various optimization, artificial intelligence and machine learning techniques for the inverse design of nanophotonic structures and imaging beyond the diffraction limit.

Growth of complex semiconductors for metamaterials, plasmonics

and epsilon-near-zero photonics

 

Materials Discovery for Nanoscale Optics

This project investigates how advanced materials atomically engineered to have designer optical properties can be used to create new (or enhance existing) functionalities for various optoelectronic and nanophotonic applications. A high throughput combinatorial approach is taken using UHV wedge-based physical vapour deposition techniques. This allows rapid screening and mapping of various material properties for an entire compositional space of a binary or ternary alloy. Identified materials are then used to enable a host of revolutionary new devices in a single nanostructured film. In particular, my research concentrate on the chalcogenide family of materials due to their rich palette of optical properties. For example they can be extremely high- or low-refractive index media; with properties that can be switched by light, electric or magnetic signals; and can be ‘topological insulators’ with intriguing electromagnetic surface states.

Adv. Mater. 31, 1807083 (2019)

Adv. Mater. 29(9), 1604268 (2017)

Nanoscale, 6, 12792-12797 (2014) 

Opt. Express 26 (16), 20861-20867 (2018)

Science 366, 6462, 186-187 (2019)

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TEXTILES

Reconfigurable metasurfaces

 

Reconfigurable free-space and integrated 
metamaterials, metasurfaces and metadevices

 

From their emergence as a paradigm for engineering new passive electromagnetic properties such as negative refractive index or perfect absorption, metamaterial concepts have extended rapidly to include a wealth of dynamic - switchable, tunable, reconfigurable, and nonlinear optical functionalities, typically through the hybridization of plasmonic (noble metal) metamaterials/surfaces with active media. Our area of interest: Phase-change materials have featured prominently in this evolution and offer a uniquely flexible platform for the realization of a range of non-volatile, optoelectronically reconfigurable metasurfaces with applications ranging from signal modulation, routing, dispersion control and optical memory to solid-state displays.
 

Adv. Mater. 25, 3050-3054 (2013)

Appl. Phys. Lett. 96, 143105 (2010)

Nature Photon. 10, 60-65 (2016)

Appl. Phys. Lett. 109, 051103 (2016)

Adv. Opt. Mater. 19 (2018)

Nature Photon.15, 717 (2021)

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Multimaterial Optical fibres

 
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Multimaterial optical fibres

Optical fibers provide a mature mass-manufacturable technology that has given rise to complex networks of interconnected computing nodes transferring information around the planet. Our research in this area involves various activities: novel fabrication techniques enabling multi-material nano-composite embedded fibers, metal cored plasmonic fibres, all-optical fibre based devices for in-line information processing, and the exploration of novel networks and devices for all-optical neuromorphic computing.

Nature: Scientific Reports 6, 35409 1-8 (2016)

Adv. Opt. Mater. 3(5), 635-641 (2015)

CLEO: Science and Innovations (2016)

Neuromorphic optics and optical transistors

 

Neuromorphic optics and optical transistors

The search for alternative materials and architectures to realize efficient neuromorphic components is an area of intense research. Recent implementations include the use of phase change, nanoionics, and other metal–insulator transitions in thin films of chalcogenides and oxides to achieve brain-inspired functionality. Our interest here lies in the use of photosensitive glasses as all-optical axons and synapses  for emerging all-optical brain-inspired neuromorphic computing applications.

Adv. Opt. Mater. 3(5), 635-641 (2015)

Science 336, 1515–1516 (2012)

European Conference on Lasers and Electro-Optics (2015)
Appl. Phys. Lett. 119, 031104 (2021)

Optoelectronic switching phenomena

 

Optoelectronic Switching phenomena

Future network architectures require a new generation of adaptable integrated nanophotonic devices which are capable of functions such as optical and electronic switching and mode (de)multiplexing. Our research here concentrates on optoelectronic switching phenomena such as phase change, photodarkening and photo/nano-ionic effects as a means for data storage, multiplexing or information processing. 

Nature Communications 5, 5346 (2014)

Physica Status Solidi B 250, 5, 994-998, (2013)

Applied Physics Letters 105(8), 083506 (2014)

NPG Asia Materials10: 533-539 (2018)

Advanced Optical Materials 9, 2101046 (2021)

GeSb nanowire phase change electronic data storage (PCRAM)