Publications de Pascal Gallo | EPFL Graph Search

Single crystal diamond gain mirrors for high performance vertical external cavity surface emitting lasers

Niels Quack, Grigore Suruceanu, Alexandru Mereuta, Andrei Caliman, Pascal Gallo, Gergely Huszka, Mehdi Naamoun

We report on the design, fabrication and optical performance of gain mirrors in single crystal diamond substrates for vertical external cavity surface emitting lasers (VECSELs). VECSELs have gained attention recently due to their potential for high emissio ...

2020

Reactive ion etching of single crystal diamond by inductively coupled plasma: State of the art and catalog of recipes

Niels Quack, Pascal Gallo, Marcell Kristof Kiss, Teodoro Graziosi, Sichen Mi, Mehdi Naamoun

2020

Flip-Chip Wafer-Fused OP-VECSELs Emitting 3.65 W at the 1.55-mu m Waveband

Elyahou Kapon, Alok Rudra, Grigore Suruceanu, Alexandru Mereuta, Andrei Caliman, Pascal Gallo

Optically pumped vertical external cavity surface emitting lasers (VECSELs) based on flip-chip gain mirrors emitting at the 1.55 mu m wavelength range are reported. The gain mirrors employ wafer-fused InAlGaAs/InP quantum well heterostructures and GaAs/AlA ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2019

Single crystalline diamond part production method for stand alone single crystalline mechanical and optical component production

Niels Quack, Pascal Gallo, Marcell Kristof Kiss, Teodoro Graziosi

The present invention relates to a free-standing single crystalline diamond part and a single crystalline diamond part production method. The method includes the steps of: - providing a single crystalline diamond substrate or layer; - providing a first adh ...

2019

1.55-mu m wavelength wafer-fused OP-VECSELs in flip-chip configuration

Elyahou Kapon, Alexandru Mereuta, Andrei Caliman, Pascal Gallo

Optically-pumped vertical external cavity surface emitting lasers (VECSELs) based on flip-chip gain mirrors emitting at the 1.55-mu m wavelength range are reported. The gain mirrors employ wafer-fused InAlGaAs/InP quantum well heterostructures and GaAs/AlA ...

SPIE-INT SOC OPTICAL ENGINEERING2019

Self-formation of hexagonal nanotemplates for growth of pyramidal quantum dots by metalorganic vapor phase epitaxy on patterned substrates

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Romain Carron, Alessandro Surrente, Pascal Gallo

We demonstrate the self-formation of hexagonal nanotemplates on GaAs (111)B substrates patterned with arrays of inverted tetrahedral pyramids during metal-organic vapor phase epitaxy and its role in producing high-symmetry, site-controlled quantum dots (QD ...

Tsinghua Univ Press2016

Effect of Pure Dephasing and Phonon Scattering on the Coupling of Semiconductor Quantum Dots to Optical Cavities

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Milan Calic, Alexey Lyasota

Using site-controlled semiconductor quantum dots (QDs) free of multiexcitonic continuum states, integrated with photonic crystal membrane cavities, we clarify the effects of pure dephasing and phonon scattering on exciton-cavity coupling in the weak-coupli ...

Amer Physical Soc2016

Exciton dynamics in a site-controlled quantum dot coupled to a photonic crystal cavity

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Alexey Lyasota

Exciton and cavity mode (CM) dynamics in site-controlled pyramidal quantum dots (QDs), integrated with linear photonic crystal membrane cavities, are investigated for a range of temperatures and photo-excitation power levels. The absence of spurious multi- ...

Amer Inst Physics2015

Site-controlled InGaAs/GaAs pyramidal quantum dots grown by MOVPE on patterned substrates using triethylgallium

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Bruno Marie Dominique Rigal, Alexey Lyasota

The fabrication and characterization of site-controlled InGaAs/GaAs quantum dots (QDs) made by MOVPE using triethylgallium (TEGa) on patterned {111}B GaAs substrates are reported. Results are compared to more traditional pyramidal QD structures grown emplo ...

Elsevier Science Bv2015

Integration of multiple site-controlled pyramidal quantum dot systems with photonic-crystal membrane cavities

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Alexey Lyasota

We describe the fabrication, epitaxial growth and photoluminescence (PL) spectra of systems of site-controlled pyramidal quantum dots (QDs) integrated with photonic crystal (PhC) membrane cavities. The spectra of the individual QDs are characterized by sca ...

Elsevier Science Bv2015

Site-controlled quantum dots coupled to a photonic crystal molecule

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Milan Calic, Bruno Marie Dominique Rigal

Two site-controlled quantum dots (QDs) were integrated in a photonic crystal molecule (PCM) formed by L3 nanocavities. A statistical analysis of the coupled cavity modes demonstrated the formation of bonding and anti-bonding delocalized PCM states. Exciton ...

American Institute of Physics2015

Polarization properties and disorder effects in H-3 photonic crystal cavities incorporating site-controlled, high-symmetry quantum dot arrays

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Alessandro Surrente, Pascal Gallo, Marco Felici

We report on the effects of optical disorder on breaking the symmetry of the cavity modes of H-3 photonic crystal cavities incorporating site-controlled pyramidal quantum dots (QDs) as the internal light source. The high in-plane symmetry of the polarizati ...

Amer Inst Physics2015

Double-diamond high-contrast-gratings vertical external cavity surface emitting laser

Elyahou Kapon, Alexei Sirbu, Vladimir Iakovlev, Pascal Gallo

A new design of vertical external cavity surface emitting laser (VECSEL) with diamond-based high contrast gratings is proposed. The self-consistent model of laser operation has been calibrated based on experimental results and used to optimize the new prop ...

Iop Publishing Ltd2014

Vertical cavity surface emitting laser cavity with low thermal impedance

Elyahou Kapon, Vladimir Iakovlev, Pascal Gallo

The present invention concerns new designs of VCLs with high contrast gratings (HCG) combined with diamond layer as a bottom mirror. They can be realized either with a classical V-shaped pumping scenario, or through the introduction of the pumping beam fro ...

2013

1D and 2D arrays of coupled photonic crystal cavities with a site-controlled quantum wire light source

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Kirill Atlasov, Pascal Gallo, Clément William Tendaï Jarlov, Milan Calic

We investigated experimentally 1D and 2D arrays of coupled L3 photonic crystal cavities. The optical modes of the coupled cavity arrays are fed by a site-controlled quantum wire light source. By performing photoluminescence measurements and relying on near ...

Optical Society of America2013

Transverse mode discrimination in long-wavelength wafer-fused vertical-cavity surface-emitting lasers by intra-cavity patterning

Benjamin Dwir, Elyahou Kapon, Alexei Sirbu, Vladimir Iakovlev, Alexandru Mereuta, Andrei Caliman, Nicolas Volet, Zlatko Mickovic, Pascal Gallo, Lukas Mutter

Transverse mode discrimination is demonstrated in long-wavelength wafer-fused vertical-cavity surface-emitting lasers using ring-shaped air gap patterns at the fused interface between the cavity and the top distributed Bragg reflector. A significant number ...

Optical Society of America2013

Photocurrent spectroscopy of site-controlled pyramidal quantum dots

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Jérôme Faist, Pascal Gallo, Arun Mohan

Intraband photocurrent spectroscopy of site-controlled pyramidal quantum dots by inserting them into the intrinsic region of n-i-n like quantum dot infrared photodetector structure is reported. The photovoltaic response is observed in the mid-infrared regi ...

American Institute of Physics2012

Magneto-optical properties of single site-controlled InGaAsN quantum wires grown on prepatterned GaAs substrates

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Romain Carron, Pascal Gallo, Marco Felici

The properties of single site-controlled InGaAsN quantum wires (QWRs)-both untreated and irradiated with atomic hydrogen-are probed by micro-magnetophotoluminescence spectroscopy. The strong anisotropy of the diamagnetic shift measured for different orient ...

2012

Bound and anti-bound biexciton in site-controlled pyramidal GaInAs/GaAs quantum dots

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Pascal Gallo, Clément William Tendaï Jarlov, Milan Calic

We present a detailed study of biexciton complexes formed in single, site-controlled pyramidal GaInAs/GaAs quantum dots (QDs). By using power dependent measurements and photon correlation spectroscopy, we identify the excitonic transitions of a large numbe ...

American Institute of Physics2012

Exciton confinement and trapping dynamics in double-graded-bandgap quantum nanowires

Elyahou Kapon, Alok Rudra, Pascal Gallo, Justyna Szeszko

We fabricate and study quantum dot structures incorporating quasi-one-dimensional excited states. The structures are realized by graded bandgap GaAs/AlGaAs quantum wires self-formed inside inverted tetrahedral pyramids. The ground state transitions exhibit ...

American Institute of Physics2012