Olav Solgaard
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View article: Programmable Optical Filters Based on Feed-Forward Photonic Meshes
Programmable Optical Filters Based on Feed-Forward Photonic Meshes Open
We demonstrate an integrated photonic circuit based on feed forward photonic meshes that can be programmed and reconfigured to perform arbitrary spectral filter functions. We investigate a subset of the available filter functions, demonstr…
View article: Quantum sensing of electron beams using solid-state spins
Quantum sensing of electron beams using solid-state spins Open
Scattering experiments with energetic particles, such as free electrons, have been historically used to reveal the quantum structure of matter. However, realizing coherent interactions between free-electron beams and solid-state quantum sy…
View article: Universal programmable and self-configuring optical filter
Universal programmable and self-configuring optical filter Open
Spectral filters are widely used in sensing and communicating with light, such as for separating wavelength channels in communications or sensing the specific spectra of some object or material of interest. The filter function is, however,…
View article: On-Chip Laser-Driven Free-Electron Spin Polarizer
On-Chip Laser-Driven Free-Electron Spin Polarizer Open
Spin-polarized electron beam sources enable studies of spin-dependent electric and magnetic effects at the nanoscale. We propose a method of creating spin-polarized electrons on an integrated photonics chip by laser driven nanophotonic fie…
View article: Laboratory and Simulation Development for the AstroPIC Integrated Photonic Coronagraph
Laboratory and Simulation Development for the AstroPIC Integrated Photonic Coronagraph Open
Direct characterization of potentially habitable terrestrial exoplanets around Sun-like stars requires extremely precise instrumentation capable of measuring a planet-star contrast ratio of 10-10. This instrumentation challenge pushes the …
View article: Three-Wave Interaction Grating Coupler with Sub-Decibel Insertion Loss at Normal Incidence
Three-Wave Interaction Grating Coupler with Sub-Decibel Insertion Loss at Normal Incidence Open
We report the design, fabrication in a commercial foundry, and experimental results of high-efficiency, normal incidence grating couplers for silicon photonics. We observe a maximum coupling efficiency of 85.4% (-0.69 dB) with a 1 dB bandw…
View article: High Contrast Nulling in Photonic Meshes Through Architectural Redundancy
High Contrast Nulling in Photonic Meshes Through Architectural Redundancy Open
We demonstrate a silicon photonic architecture comprised of Double Mach-Zehnder Interferometers (DMZIs) designed for high-contrast photonic applications. This configuration significantly enhances the achievable extinction ratio of photonic…
View article: Universal programmable and self-configuring optical filter
Universal programmable and self-configuring optical filter Open
We propose an approach to integrated optical spectral filtering that allows arbitrary programmability, can compensate automatically for imperfections in filter fabrication, allows multiple simultaneous and separately programmable filter fu…
View article: Enhancement of reactive oxygen species production by ultra-short electron pulses
Enhancement of reactive oxygen species production by ultra-short electron pulses Open
The development of laser-driven accelerators-on-chip has provided an opportunity to miniaturize devices for electron radiotherapy delivery. Laser-driven accelerators produce highly time-compressed electron pulses, on the 100 fs to 1 ps sca…
View article: Coupled Mode Design of Low-Loss Electromechanical Phase Shifters
Coupled Mode Design of Low-Loss Electromechanical Phase Shifters Open
Micro-electromechanical systems (MEMS) have the potential to provide low-power phase shifting in silicon photonics, but techniques for designing low-loss devices are necessary for adoption of the technology. Based on coupled mode theory (C…
View article: Subrelativistic Alternating Phase Focusing Dielectric Laser Accelerators
Subrelativistic Alternating Phase Focusing Dielectric Laser Accelerators Open
We demonstrate a silicon-based electron accelerator that uses laser optical near fields to both accelerate and confine electrons over extended distances. Two dielectric laser accelerator (DLA) designs were tested, each consisting of two ar…
View article: Scalable low-latency optical phase sensor array
Scalable low-latency optical phase sensor array Open
Optical phase measurement is critical for many applications, and traditional approaches often suffer from mechanical instability, temporal latency, and computational complexity. In this paper, we describe compact phase sensor arrays based …
View article: Scalable Low-latency Optical Phase Sensor Array
Scalable Low-latency Optical Phase Sensor Array Open
Optical phase measurement is critical for many applications and traditional approaches often suffer from mechanical instability, temporal latency, and computational complexity. In this paper, we describe compact phase sensor arrays based o…
View article: Experimentally realized in situ backpropagation for deep learning in photonic neural networks
Experimentally realized in situ backpropagation for deep learning in photonic neural networks Open
Integrated photonic neural networks provide a promising platform for energy-efficient, high-throughput machine learning with extensive scientific and commercial applications. Photonic neural networks efficiently transform optically encoded…
View article: Experimental evaluation of digitally verifiable photonic computing for blockchain and cryptocurrency
Experimental evaluation of digitally verifiable photonic computing for blockchain and cryptocurrency Open
As blockchain technology and cryptocurrency become increasingly mainstream, photonic computing has emerged as an efficient hardware platform that reduces ever-increasing energy costs required to verify transactions in decentralized crypton…
View article: Power monitoring in a feedforward photonic network using two output detectors
Power monitoring in a feedforward photonic network using two output detectors Open
Programmable feedforward photonic meshes of Mach–Zehnder interferometers are computational optical circuits that have many classical and quantum computing applications including machine learning, sensing, and telecommunications. Such devic…
View article: Scalable and self-correcting photonic computation using balanced photonic binary tree cascades
Scalable and self-correcting photonic computation using balanced photonic binary tree cascades Open
Programmable unitary photonic networks that interfere hundreds of modes are emerging as a key technology in energy-efficient sensing, machine learning, cryptography, and linear optical quantum computing applications. In this work, we estab…
View article: Integrated Amplitude and Phase Monitor for Micro-Actuators
Integrated Amplitude and Phase Monitor for Micro-Actuators Open
Micro-actuators driven on resonance maximize reach and speed; however, due to their sensitivity to environmental factors (e.g., temperature and air pressure), the amplitude and phase response must be monitored to achieve an accurate actuat…
View article: Experimental evaluation of digitally-verifiable photonic computing for blockchain and cryptocurrency
Experimental evaluation of digitally-verifiable photonic computing for blockchain and cryptocurrency Open
As blockchain technology and cryptocurrency become increasingly mainstream, ever-increasing energy costs required to maintain the computational power running these decentralized platforms create a market for more energy-efficient hardware.…
View article: Experimentally realized in situ backpropagation for deep learning in nanophotonic neural networks
Experimentally realized in situ backpropagation for deep learning in nanophotonic neural networks Open
Neural networks are widely deployed models across many scientific disciplines and commercial endeavors ranging from edge computing and sensing to large-scale signal processing in data centers. The most efficient and well-entrenched method …
View article: High gradient silicon carbide immersion lens ultrafast electron sources
High gradient silicon carbide immersion lens ultrafast electron sources Open
We present two compact ultrafast electron injector designs with integrated focusing that provide high peak brightness of up to 1.9 × 1012 A/m2 Sr2 with 10’s of electrons per laser pulse using silicon carbide electrodes and silicon nanotip …
View article: Quantum Nature of Dielectric Laser Accelerators
Quantum Nature of Dielectric Laser Accelerators Open
Dielectric laser accelerators (DLAs) hold great promise for producing economic and compact on-chip radiation sources. On-chip DLAs benefit from fabrication capabilities of the silicon industry and from breakthroughs in silicon-photonic nan…
View article: Electron Pulse Compression with Optical Beat Note
Electron Pulse Compression with Optical Beat Note Open
Compressing electron pulses is important in many applications of electron beam systems. In this study, we propose to use optical beat notes to compress electron pulses. The beat frequency is chosen to match the initial electron pulse durat…
View article: Optical Fiber Photonic Crystal Hydrophone for Cellular Acoustic Sensing
Optical Fiber Photonic Crystal Hydrophone for Cellular Acoustic Sensing Open
This paper describes the design, characterization, and testing of a compact hydrophone capable of measuring acoustic signals from cardiomyocytes. Our hydrophone consists of a nanofabricated photonic-crystal diaphragm externally-mounted to …
View article: Wavelength-Division Multiplexed Optical Cryptocurrency
Wavelength-Division Multiplexed Optical Cryptocurrency Open
We propose an optical proof-of-work scheme that feeds data encoded into wavelength-division multiplexed modes through a programmable photonic network. We verify robustness by modeling network dispersion, allowing for energy-efficient optic…
View article: Operating modes of dual-grating dielectric laser accelerators
Operating modes of dual-grating dielectric laser accelerators Open
In this work, we present a comprehensive theoretical description of the Lorentz force in dual-grating dielectric laser accelerators (DLA). Here we examine the dual-grating DLA under arbitrary illumination conditions, both single-side and d…
View article: High-speed axially swept light sheet microscopy using a linear MEMS phased array for isotropic resolution
High-speed axially swept light sheet microscopy using a linear MEMS phased array for isotropic resolution Open
Use of PAs is compatible with axially swept light sheet microscopy and offers significant improvements in speed.
View article: Design of a multichannel photonic crystal dielectric laser accelerator
Design of a multichannel photonic crystal dielectric laser accelerator Open
To be useful for most scientific and medical applications, compact particle accelerators will require much higher average current than enabled by current architectures. For this purpose, we propose a photonic crystal architecture for a die…