Publications de Momchil Minkov

Doubly resonant second-harmonic generation of a vortex beam from a bound state in the continuum

Jean-François Carlin, Romuald Houdré, Nicolas Grandjean, Matteo Galli, Momchil Minkov, Jun Wang, Marco Clementi

Second-harmonic generation in nonlinear materials can be greatly enhanced by realizing doubly resonant cavities with high quality factors. However, fulfilling such doubly resonant condition in photonic crystal (PhC) slab cavities is a long-standing challen ...

2020

Finite-Size and Disorder Effects on Slow-Light Propagation in an Extended Photonic Crystal Coupled-Cavity Waveguides with Group-Index Bandwidth Product Exceeding 0.47

Vincenzo Savona, Romuald Houdré, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

IEEE2018

Ultra-wide-band structural slow light

Vincenzo Savona, Romuald Houdré, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

The ability of using integrated photonics to scale multiple optical components on a single monolithic chip offers key advantages to create miniature light-controlling chips. Numerous scaled optical components have been already demonstrated. However, presen ...

Nature Research2018

Influence of Disorder and Finite-Size Effects on Slow Light Transport in Extended Photonic Crystal Coupled-Cavity Waveguides

Vincenzo Savona, Romuald Houdré, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

A convenient approach for slowing down light in integrated optical circuits is by utilizing a set of coupled microcavities in a photonic crystal lattice. While this provides for flexibility in dispersion engineering, light transport is influenced by a comb ...

2018

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

Vincenzo Savona, Jean-François Carlin, Romuald Houdré, Nicolas Grandjean, Matteo Galli, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

We report on nonlinear frequency conversion from the telecom range via second harmonic generation (SHG) and third harmonic generation (THG) in suspended gallium nitride slab photonic crystal (PhC) cavities on silicon, under continuous-wave resonant excitat ...

2017

Photonic crystal slab cavity simultaneously optimized for ultra-high Q/V and vertical radiation coupling

Vincenzo Savona, Momchil Minkov

We present a design for a two-dimensional photonic crystal slab cavity in which the electric field localization is due to an extra hole in the lattice, as opposed to the more standard procedure of removal of holes. This leads to a tighter field confinement ...

American Institute of Physics2017

A compact, integrated silicon device for the generation of spectrally filtered, pair-correlated photons

Vincenzo Savona, Momchil Minkov

The third-order nonlinearity of silicon gives rise to a spontaneous four-wave mixing process in which correlated photon pairs are generated. Sources based on this effect can be used for quantum computation and cryptography, and can in principle be integrat ...

Iop Publishing Ltd2016

Numerical study and optimization of photonic crystals

Momchil Minkov

Photonic crystals (PhCs) are engineered nanostructures that enable an extraordinary control over the flow of light. These structures can be fabricated out of common semiconductors, are compatible with existing industrial fabrication technologies, and are e ...

EPFL2016

Haldane quantum Hall effect for light in a dynamically modulated array of resonators

Vincenzo Savona, Momchil Minkov

Topological insulators have attracted abundant attention for a variety of reasons-notably, the possibility for lossless energy transport through edge states "protected" against disorder. Topological effects such as the quantum Hall state can be induced thr ...

Optical Soc Amer2016

Wide-band slow light in compact photonic crystal coupled-cavity waveguides

Vincenzo Savona, Momchil Minkov

Slow light has a variety of applications, in particular for enhanced nonlinear effects like four-wave mixing and high-harmonic generation. Here, we propose a photonic crystal coupled-cavity waveguide with an ultracompact arrangement of the constituent cavi ...

Optical Soc Amer2015

Remote macroscopic entanglement on a photonic crystal architecture

Vincenzo Savona, Momchil Minkov, Hugo Pierre Alexandre Flayac

The outstanding progress in nanostructure fabrication and cooling technologies allows what was unthinkable a few decades ago: bringing single-mode mechanical vibrations to the quantum regime. The coupling between photon and phonon excitations is a natural ...

American Physical Society2015

Optimizing doubly-resonant photonic crystal cavity modes for second harmonic generation

Vincenzo Savona, Momchil Minkov

We optimize a photonic crystal slab for the generation of second harmonic. The optimization consists in two steps. In the first step a regular photonic crystal, consisting in a triangular lattice of circular holes in a dielectric slab, is optimized by allo ...

Spie-Int Soc Optical Engineering2014

Global Optimization of Ultrahigh-Q H0 Photonic Crystal Nanocavity in Silicon

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov, Mario Lucien Henri Tonin

The design of photonic crystal cavities has always presented a considerable challenge over the past two decades. In this work, a global optimization technique has been used to maximize the Q/V ratio of a simple H0 type nanocavity. The optimization is carri ...

Ieee2014

Gallium nitride L3 photonic crystal cavities with an average quality factor of 16 900 in the near infrared

Vincenzo Savona, Jean-François Carlin, Nicolas Grandjean, Matteo Galli, Raphaël Butté, Noelia Vico Triviño, Momchil Minkov

Photonic crystal point-defect cavities were fabricated in a GaN free-standing photonic crystal slab. The cavities are based on the popular L3 design, which was optimized using an automated process based on a genetic algorithm, in order to maximize the qual ...

American Institute of Physics2014

Automated optimization of photonic crystal slab cavities

Vincenzo Savona, Momchil Minkov

Thanks to their high quality factor, combined to the smallest modal volume, defect-cavities in photonic crystal slabs represent a promising, versatile tool for fundamental studies and applications in photonics. In paricular, the L3, H0, and H1 defects are ...

Nature Publishing Group2014

High-Q silicon photonic crystal cavity for enhanced optical nonlinearities

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov, Mario Lucien Henri Tonin

We fabricate and experimentally characterize an H0 photonic crystal slab nanocavity with a design optimized for maximal quality factor, Q = 1.7 x 10(6). The cavity, fabricated from a silicon slab, has a resonant mode at lambda = 1.59 mu m and a measured Q- ...

American Institute of Physics2014

Genetically designed L3 photonic crystal nanocavities with measured quality factor exceeding one million

Vincenzo Savona, Matteo Galli, Momchil Minkov

We report on the experimental realization of ultra-high quality factor (Q) designs of the L3-type photonic crystal nanocavity. Based on genetic optimization of the positions of few nearby holes, our design drastically improves the performance of the conven ...

American Institute of Physics2014

Long-distance radiative excitation transfer between quantum dots in disordered photonic crystal waveguides

Vincenzo Savona, Momchil Minkov

We theoretically investigate the magnitude and range of the photon-mediated interaction between two quantum dots embedded in a photonic crystal waveguide, including fabrication disorder both in the crystal and in the dot positioning. We find that disorder- ...

Amer Physical Soc2013

Statistics of the disorder-induced losses of high-Q photonic crystal cavities

Vincenzo Savona, Romuald Houdré, Ulagalandha Perumal Dharanipathy, Momchil Minkov

We analyze and compare the effect of fabrication disorder on the quality factor of six well-known high-index photonic crystal cavity designs. The theoretical quality factors for the different nominal structures span more than three orders of magnitude, ran ...

Optical Society of America2013

Radiative coupling of quantum dots in photonic crystal structures

Vincenzo Savona, Momchil Minkov

2013