Publications de Arslan Sajid Raja

Probing the Formation of Nonlinear Optical States with Free Electrons

Rui Ning Wang, Tobias Kippenberg, Arslan Sajid Raja, Guanhao Huang, Alexey Tikan, Aleksandr Tusnin, Zheru Qiu, Yujia Yang

Combining nonlinear integrated photonics with electron microscopy, we probe the formation of optical dissipative structures in Si3N4 microresonators with free electrons and find unique spectral fingerprints in the electron spectrum that enable new electron ...

Institute of Electrical and Electronics Engineers Inc.2024

Coupling Free Electrons and Cavity Photons in a Transmission Electron Microscope

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang, Zheru Qiu, Yujia Yang

We couple free electrons to the optical modes of a photonic microring resonator. Inelastic electron scattering leads to the generation of cavity photons, correlated to the electrons in time and energy loss. ...

Institute of Electrical and Electronics Engineers Inc.2024

Unifying Optical Frequency Metrology with Free-Electron Spectroscopy

Thomas La Grange, Rui Ning Wang, Tobias Kippenberg, Fabrizio Carbone, Arslan Sajid Raja, Alexey Sapozhnik, Yujia Yang

We establish a frequency link across the microwave, optical, and free-electron domains by a photonic chip-based electron phase modulator driven by a continuous-wave laser locked to a fully stabilized optical frequency comb. ...

Institute of Electrical and Electronics Engineers Inc.2024

Free-electron interaction with nonlinear optical states in microresonators

Rui Ning Wang, Tobias Kippenberg, Arslan Sajid Raja, Guanhao Huang, Alexey Tikan, Aleksandr Tusnin, Zheru Qiu, Yujia Yang

The short de Broglie wavelength and strong interaction empower free electrons to probe structures and excitations in materials and biomolecules. Recently, electron-photon interactions have enabled new optical manipulation schemes for electron beams. In thi ...

American Association for the Advancement of Science2024

Integrated photon-pair source with monolithic piezoelectric frequency tunability

Rui Ning Wang, Tobias Kippenberg, Arslan Sajid Raja, Anat Siddharth

This work demonstrates the capabilities of an entangled photon-pair source at telecom wavelengths, based on a photonic integrated Si3N4 microresonator with monolithically integrated piezoelectric frequency tuning. Previously, frequency tuning of photon pai ...

AMER PHYSICAL SOC2023

A High-Resolution Photonic Integrated High Q Microresonator Based Accelerometer

Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Anat Siddharth

We demonstrated a packaged optomechanical accelerometer with resolution of 850ng. The resonance of a 4 million Q Si3N4 microring resonator is modulated by the stress in springs of a released milligram proof mass upon acceleration. ...

Optical Society of America2023

Linear and nonlinear applications of miniaturized silicon nitride microresonators

Arslan Sajid Raja

Photonic integrated circuits (PICs) are the subject of massive interest due to the range of applications they can provide at a huge scale while building on well-established CMOS technologies. One of the critical parameters defining a technology's maturity ...

EPFL2023

Photon Fock State Generation in Photonic Microresonators

Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang, Zheru Qiu, Yujia Yang

We generate correlated pairs of free electrons and cavity photons by sending an electron beam across a photonic microresonator and filtering temporal coincidences. We further characterize the pairs analogue to a heralded single photon source. ...

Optical Society of America2023

Free Electron Interaction with Nonlinear Optical States

Rui Ning Wang, Tobias Kippenberg, Arslan Sajid Raja, Guanhao Huang, Alexey Tikan, Aleksandr Tusnin, Zheru Qiu, Yujia Yang

We couple free electrons with nonlinear optical states and frequency combs in photonic chip-based microresonators. Intracavity nonlinear dissipative structures including optical solitons imprint unique fingerprints in electron spectra and their Ramsey inte ...

Optical Society of America2023

Electron spectrometer calibration method

Thomas La Grange, Tobias Kippenberg, Fabrizio Carbone, Arslan Sajid Raja, Alexey Sapozhnik, Yujia Yang

The present invention concerns an energy dispersion calibration method for calibrating an electron spectrometer of an electron spectrometer system including at least one electron emission source, electron optics and the electron spectrometer. The method co ...

2023

Cavity-mediated electron-photon pairs

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang, Zheru Qiu, Yujia Yang

Quantum information, communication, and sensing rely on the generation and control of quantum correlations in complementary degrees of freedom. Free electrons coupled to photonics promise novel hybrid quantum technologies, although single-particle correlat ...

American Association for the Advancement of Science2022

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Nils Johan Engelsen, Guanhao Huang, Jijun He, Tianyi Liu

Low-loss photonic integrated circuits and microresonators have enabled a wide range of applications, such as narrow-linewidth lasers and chip-scale frequency combs. To translate these into a widespread technology, attaining ultralow optical losses with est ...

Nature Research2021

Coherent terahertz-to-microwave link using electro-optic-modulated Turing rolls

Tobias Kippenberg, Miles Henry Anderson, Arslan Sajid Raja, Wenle Weng, Jijun He, Anat Siddharth

Arising from modulation instability, Turing rolls in optical Kerr microresonators have been used in the generation of optical frequency combs and the synthesis of microwave and terahertz frequencies. In this work, by applying electro-optic modulation on te ...

AMER PHYSICAL SOC2021

Continuous-wave electron-photon interactions using chip-based high-Q Si3N4 microresonator

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang

We observe CW-driven electron-photon interaction using a fiber-integrated high-Q Si3N4 microresonator, enabled by strong resonantly enhanced coupling with the confined optical mode. (C) 2021 The Author(s) ...

IEEE2021

Fully self-contained turn-key soliton microcomb source

Rui Ning Wang, Tobias Kippenberg, John David Jost, Junqiu Liu, Grigorii Likhachev, Arslan Sajid Raja, Jijun He

We demonstrate a turn-key microcomb source based on 100 GHz Si3N4 ring microresonator. The device is fully optically and electronically integrated in a compact box, which runs by pushing one button. ...

IEEE2021

Ultrafast optical circuit switching for data centers using integrated soliton microcombs

Tobias Kippenberg, Maxim Karpov, Junqiu Liu, Arslan Sajid Raja, Anton Lukashchuk

Optical technologies could enable fast and power-efficient networks for data centers. Here, the authors report Si3N4 microcomb based ultrafast photonic switching to provide enhanced performance for data center applications. ...

Nature Portfolio2021

Parallel convolutional processing using an integrated photonic tensor core

Tobias Kippenberg, Maxim Karpov, Junqiu Liu, Arslan Sajid Raja, Anton Lukashchuk

With the proliferation of ultrahigh-speed mobile networks and internet-connected devices, along with the rise of artificial intelligence (AI)(1), the world is generating exponentially increasing amounts of data that need to be processed in a fast and effic ...

NATURE RESEARCH2021

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Nils Johan Engelsen, Guanhao Huang, Jijun He

IEEE2021

Continuous-wave electron-light interaction in high-Q whispering gallery microresonators

Rui Ning Wang, Tobias Kippenberg, Junqiu Liu, Arslan Sajid Raja, Guanhao Huang

IEEE2021

Low-Loss Integrated Nanophotonic Circuits with Layered Semiconductor Materials

Rui Ning Wang, Tobias Kippenberg, Philippe Andreas Rölli, Clément Christian Javerzac-Galy, Junqiu Liu, Arslan Sajid Raja, Jijun He, Mikhail Churaev

Monolayer transition-metal dichalcogenides with direct bandgaps are emerging candidates for optoelectronic devices, such as photodetectors, light-emitting diodes, and electro-optic modulators. Here we report a low-loss integrated platform incorporating mol ...

AMER CHEMICAL SOC2021