Our main scientific interest is nanophotonics and in particular the coherent interaction of light with mesoscopic and nanoscale complex photonic systems. 

Our research activity is focussed on single-emitter spectroscopy, mainly in complex nanophotonic systems and photonic networks. When many light emitters are coupled we study collective effects such as stimulated emission and lasing. 

Single emitter NANOSCALE spectroscopy

Nanophotonics and nanoscale optics, which are aimed at coherent control and manipulation of single photons emitted by individual quantum emitters in a nanostructured photonic environment offer a revolutionary new approach to computation and information technology: bits can be carried in the state of light and processed by nanoscopic amount of matter. We are studying the generation of single photons and their routing to specific distant location. 

 
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MODAL COUPLING OF SINGLE PHOTON EMITTERS WITHIN NANOFIBRE WAVEGUIDES

We have shown that soft-matter nanofibers can channel individual photons into fibre modes that can transport them at distant locations, for example on a chip.  These nanofibers do not rely on resonant interactions, making them ideal for room-temperature operation, and offer a scalable platform for future quantum information technology. Link to the paper.


COMPLEX PHOTONIC NETWORKS

Complex nanophotonic networks offer a unique approach to light transport and light emission control, by designing a set of distributed single emitters that share information through photonic connections, and that can be remotely addressed. 

INDIVIDUAL QUANTUM DOTS IN A RANDOM PHOTONIC NETWORK

Each appearing and disappearing white spot is a quantum dot blinking, encapsulated in a network of subwavelength optical fibres.

HYPERUNIFORM DISORDERED NETWORKS

Hyperuniform disordered photonic materials are a new class of materials that harness structural disorder and control light transport, emission and absorption in unique ways, beyond the constraints imposed by conventional photonic microcircuit architectures. 
Together with Marian Florescu (Surrey University) we are studying the physics and application of hyperuniform disordered nanophotonic structures.


Unconventional and random lasing

Lasers are directional and monochromatic sources of radiation. Contrary to common beliefs none of these properties are key to a laser, as the only requirement is that the radiation is originated by stimulated emission instead of spontaneous emission. While spontaneous emission is ubiquitous, as in an ordinary lamp for example, stimulation is a complicate process that requires light trapping and optical  amplification. Disordered media can trap light via multiple scattering and sustain stimulate emission as unconventional source of laser light: random lasing.

BIOCOMPATIBLE RANDOM LASING

Random lasing, where light amplification and lasing emerge from light trapped in a disordered matrix, naturally has a biocompatible porous form, is as small as ~10 μm, and can become the ideal candidate for integration with living tissues. With this goal in mind we have developed a natural silk disordered matrix capable of lasing. Link to the paper, and pdf.

We have also developed a diffusive dispersive model of random lasing, we are happy to share the code if you are interested. Link to the paper, and pdf.