Publications de Alok Rudra | EPFL Graph Search

Gate-Tunable Hole Transport in In-Plane Ge Nanowires by V-Groove Confined Selective Epitaxy

Alok Rudra, Anna Fontcuberta i Morral, Santhanu Panikar Ramanandan, Victor Carle Adrien Boureau

Germanium (Ge) nanowires hold great promise as building blocks for hole spin-based quantum processors. Realizing this potential requires their direct integration onto silicon (Si) wafers. This work introduces V-groove-confined selective epitaxy to enable t ...

WILEY-V C H VERLAG GMBH2025

Spatial quantum-interference landscapes of multi-site-controlled quantum dots coupled to extended photonic cavity modes

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

A compact platform to integrate emitters in a cavity-like support is to embed quantum dots (QDs) in a photonic crystal (PhC) structure, making them promising candidates for integrated quantum photonic circuits. The emission properties of QDs can be modifie ...

2025

Nucleation-Limited Kinetics of GaAs Nanostructures Grown by Selective Area Epitaxy: Implications for Shape Engineering in Optoelectronics Devices

Alok Rudra, Anna Fontcuberta i Morral, Michele Zendrini, Valerio Piazza

This dataset corresponds to the following manuscript: Zendrini, M., Dubrovskii, V., Rudra, A., Dede, D., Fontcuberta i Morral, A., Piazza, V. “Nucleation-Limited Kinetics of GaAs Nanostructures Grown by Selective Area Epitaxy: Implications for Shape Engi ...

Zenodo2024

Control of Ge island coalescence for the formation of nanowires on silicon

Alok Rudra, Anna Fontcuberta i Morral, Santhanu Panikar Ramanandan

Germanium nanowires could be the building blocks of hole-spin qubit quantum computers. Selective area epitaxy enables the direct integration of Ge nanowires on a silicon chip while controlling the device design, density, and scalability. For this to become ...

2024

Nucleation-Limited Kinetics of GaAs Nanostructures Grown by Selective Area Epitaxy: Implications for Shape Engineering in Optoelectronics Devices

Alok Rudra, Anna Fontcuberta i Morral, Michele Zendrini, Didem Dede, Valerio Piazza

The growth kinetics of vertical III−V nanowires (NWs) were clarified long ago. The increasing aspect ratio of NWs results in an increase in the surface area, which, in turn, enhances the material collection. The group III adatom diffusion from the NW sidew ...

American Chemical Society (ACS)2024

Spatial Avoided Crossing in Optical Emission of Site-Controlled Pyramidal Quantum Dots in Photonic Crystal Cavities

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

Interactions of site-controlled quantum dots with a high-order cavity mode of an L7-type photonic crystal cavity are resolved spatially and spectrally. We observed a spatial avoided crossing in polarization-resolved optical emission of quantum dots. ...

Institute of Electrical and Electronics Engineers Inc.2024

Data set for control of Ge island coalescence for the formation of nanowires on silicon

Alok Rudra, Anna Fontcuberta i Morral, Sara Marti Sanchez, Santhanu Panikar Ramanandan, Joel René Sapera, Vladimir Dubrovskii

This document contains all the data and the details of the analysis used in the manuscript titled " Control of Ge island coalescence for the formation of nanowires on silicon." https://doi.org/10.1039/D3NH00573A ...

EPFL Infoscience2024

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

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

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

Site-controlled QD embedded coupled photonic crystal cavity waveguides for on-chip photon routing

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

We demonstrate the on-chip photon routing on a site-controlled quantum dots embedded W1 photonic crystal waveguides side coupled to a L3 cavity. Observed photon propagation through the device indicates the connectivity of all photonic elements. ...

Optical Society of America2023

Single site-controlled inverted pyramidal InGaAs QD-nanocavity operating at the onset of the strong coupling regime

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

Precise positioning of single site-controlled inverted pyramidal InGaAs quantum dots (QDs) at the antinode of a GaAs photonic crystal cavity with nanometer-scale accuracy holds unique advantages compared to self-assembled QDs and offers great promise for p ...

Aip Publishing2023

Exciton-polariton dynamics of the single site-controlled quantum dot-nanocavity in the coexisting strong-weak coupling regime

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

Deterministic positioning single site-controlled high symmetric InGaAs quantum dots (QDs) in (111)B-oriented GaAs photonic crystal cavities with nanometer-scale accuracy provides an idea component for building integrated quantum photonic circuits. However, ...

IOP Publishing Ltd2023

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

Alok Rudra, Anna Fontcuberta i Morral, Nicholas Paul Morgan, Marie Sophie Sanglé-Ferrière, Didem Dede, Valerio Piazza, Ann-Kristin Stief, Vladimir Dubrovskii

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

AMER CHEMICAL SOC2023

Physical origins of optical anisotropy in quantum-confined semiconductors: The roles of valence band mixing, transition broadening, and state filling

Elyahou Kapon, Alok Rudra, Mikhail Lazarev

We investigate experimentally and theoretically the impact of valence band mixing and spectrum of confined states on the polarization of light emitted from or absorbed by GaAs/AlGaAs semiconductor quantum dots and quantum wires with tailored heterostructur ...

AIP Publishing2023

Coherent Hole Transport in Selective Area Grown Ge Nanowire Networks

Alok Rudra, Anna Fontcuberta i Morral, Nicholas Paul Morgan, Andrea Giunto, Santhanu Panikar Ramanandan

Holes in germanium nanowires have emerged as a realistic platform for quantum computing based on spin qubit logic. On top of the large spin–orbit coupling that allows fast qubit operation, nanowire geometry and orientation can be tuned to cancel out charge ...

American Chemical Society (ACS)2022

Mode Interference Effect in Optical Emission of Quantum Dots in Photonic Crystal Cavities

Benjamin Dwir, Elyahou Kapon, Alok Rudra, Clément William Tendaï Jarlov, Milan Calic, Alexey Lyasota, Alessio Massimiliano Davide Miranda

Radiation properties of a pointlike source of light, such as a molecule or a semiconductor quantum dot, can be tailored by modifying its photonic environment. This phenomenon lies at the core of cavity quantum electrodynamics (CQED). Quantum dots in photon ...

American Physical Society2022

Coherent Hole Transport in Selective Area Grown Ge Nanowire Networks

Alok Rudra, Nicholas Paul Morgan, Andrea Giunto, Santhanu Panikar Ramanandan

This document contains all the raw data files used for the manuscript. ...

EPFL Infoscience2022

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

Benjamin Dwir, Elyahou Kapon, Alok Rudra, 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

Remote excitation between quantum emitters mediated by an optical Fano resonance

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

Remote coupling between quantum emitters is of great importance for constructing quantum networks. Conventionally, this can be achieved via photon exchange by incorporating the quantum emitters in a waveguide or a large cavity. However, such photonic struc ...

OPTICAL SOC AMER2021

Towards strong-coupling regime in singular site-controlled InGaAs quantum dots-nanocavities

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

We demonstrate the cavity quantum electrodynamics towards strong- coupling regime mediated by cavity loss and exciton pure dephasing in singular site-controlled quantum dotnanocavity system, studied by micro-photoluminescence (mu-PL) and time- resolved PL ...

IEEE2021

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

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

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