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Alok Rudra

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Related publications (84)

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

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Pascal Gallo, Kirill Atlasov, 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

The implementation of thermal and UV nanoimprint lithography for selective area epitaxy

Anna Fontcuberta i Morral, Alok Rudra, Didem Dede, Nicholas Paul Morgan, Valerio Piazza, Santhanu Panikar Ramanandan

Semiconductor nanowires (NWs) in horizontal configuration could provide a path for scalable NW-based devices. Bottom-up large-scale manufacturing of these nanostructures by selective area epitaxy (SAE) relies on precise nanopatterning of various shapes on ...

2023

Large mode splitting and lasing in optimally coupled photonic-crystal microcavities

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Kirill Atlasov

Coupling of L-type photonic-crystal (PhC) cavities in a geometry that follows inherent cavity field distribution is exploited for demonstrating large mode splitting of up to similar to 10-20 nm (similar to 15-30 meV) near 1 mu m wavelength. This is much la ...

Optical Society of America2011

Symmetries and the Polarized Optical Spectra of Exciton Complexes in Quantum Dots

Elyahou Kapon, Alok Rudra, Marc-André Dupertuis, Daniel Oberli

A systematic and simple theoretical approach is proposed to analyze true degeneracies and polarized decay patterns of exciton complexes in semiconductor quantum dots. The results provide reliable spectral signatures for efficient symmetry characterization, ...

2011

Integrated Quantum Photonics using Site-Controlled Quantum Dots and Tailored-Potential Photonic Crystals

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Alexey Lyasota, Antoine Maxime Delgoffe, Alessio Massimiliano Davide Miranda

We demonstrate several integrated photonics structures incorporating site-controlled quantum dots and photonic crystal cavities with tailored mode structures. Optimal designs for single photon extraction, routing and switching are presented and discussed. ...

IEEE2019

From Layer-by-Layer Growth to Nanoridge Formation: Selective Area Epitaxy of GaAs by MOVPE

Anna Fontcuberta i Morral, Alok Rudra, Didem Dede, Nicholas Paul Morgan, Valerio Piazza

We outline the growth mechanismand shape evolution of GaAsnanoridges by selective area MOVPE with three well-identified, distinctstages of growth. ...

AMER CHEMICAL SOC2023

Parabolic tailored-potential quantum-wires grown in inverted pyramids

Elyahou Kapon, Alok Rudra, Justyna Szeszko, Mikhail Lazarev

Quasi-one-dimensional AlGaAs quantum wires (QWRs) with parabolic heterostructure profiles along their axis were fabricated using metallorganic vapor phase epitaxy (MOVPE) On patterned (111)B GaAs substrates. Tailoring of the confined electronic states via ...

Elsevier Science Bv2015

Temperature Dependence of the Coupling between n-type d-Doping Region and Quantum Dot Assemblies

Elyahou Kapon, Alok Rudra

2006

Controllable Pure Dephasing Pathways in Single SiteControlled Pyramidal Quantum Dot - Nanocavity System

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Alessio Massimiliano Davide Miranda

We demonstrate the controllable exciton-cavity mode interaction mediated by pure dephasing in a single site-controlled quantum dot-nanocavity system. With varying detuning, Purcell enhanced dynamics and phonon-assisted cavity feeding sequentially dominate ...

IEEE2021

Investigation of coherent acoustic phonons in terahertz quantum cascade laser structures using femtosecond pump-probe spectroscopy

Elyahou Kapon, Alok Rudra, Pascal Gallo

The dynamics of acoustic vibrations in terahertz quantum cascade laser structures (THz-QCLs) is studied by means of femtosecond pump-probe spectroscopy. The phonon modes are characterized by the folding of the acoustic dispersion into an effective reduced ...

Amer Inst Physics2012

Sub-meV Photoluminescence Linewidth and >106 cm2/Vs Electron Mobility in AlGaAs/GaAs Quantum Wells Grown by Metallorganic Vapor Phase Epitaxy on Slightly Misoriented Substrates

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Daniel Oberli, Nicolas Moret

2006

Pyramidal GaAs/AlzGa1-zAs quantum wire/dot systems with controlled heterostructure potential

Elyahou Kapon, Alok Rudra, Jean-Daniel Ganière, Qing Zhu

The structural and optical properties of controlled-heterostructure-potential, low-dimensional GaAs/AlGaAs nanostructures self-formed during organometallic chemical vapor deposition in tetrahedral pyramids etched in (111) B-GaAs substrates, are investigate ...

American Physical Society2010

Very low transperancy currents in double quantum well InGaAs semiconductor lasers with δ doped resonant tunneling

Elyahou Kapon, Alok Rudra

AIP American Institute of Physics2008

1D photonic band formation and photon localization in finite-size photonic-crystal waveguides

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Pascal Gallo, Kirill Atlasov, Marco Felici

2010

A terahertz quantum cascade. laser grown by low-pressure metalorganic vapor phase epitaxy

Elyahou Kapon, Alok Rudra, Lorenzo Sirigu

AIP American Institute of Physics2008

Limiting the Spectral Diffusion of Nano-Scale Light Emitters using the Purcell effect in a Photonic-Confined Environment

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

Partial suppression of the spectral diffusion of quantum dot (QD) excitons tuned to resonance of a nano-photonic cavity is reported. The suppression is caused by the Purcell enhancement of the QD-exciton recombination rate, which alters the rate of chargin ...

Nature Research2019

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

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

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

Narrow inhomogeneous broadening of V-groove quantum wires grown on vicinal substrates

Elyahou Kapon, Alok Rudra, Benjamin Dwir, Daniel Oberli, Pascal Gallo, Nicolas Moret

Significant reduction in inhomogeneous broadening of GaAs/AlGaAs V- groove quantum wires (QWRs) is achieved by growing them on vicinal (001) GaAs substrates misaligned by several degrees with respect to the [1 (1) over bar0] groove direction. Low temperatu ...

American Institute of Physics2008

3.125Gb/s modulation up to 70°C using 1.3µm VCSELs fabricated with localized wafer fusion for 10GBASE LX4 applications

Elyahou Kapon, Alok Rudra, Alexandru Mereuta, Vladimir Iakovlev, Andrei Caliman, Grigore Suruceanu

2006

Strongly reduced exciton transfer between quantum wires

Elyahou Kapon, Alok Rudra, Klaus Leifer

AIP American Institute of Physics2007