374 citations · 2.3k across the 22 of their papers we have counts for
22 papers
Experimentally realized in situ backpropagation for deep learning in nanophotonic neural networks
Sunil Pai, Zhanghao Sun, Tyler W. Hughes +11
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 d…
Massively parallel pixel-by-pixel nanophotonic optimization using a Green's function formalism
Jiahui Wang, Alfred K. C. Cheung, Aleksandra Spyra +3
We introduce an efficient parallelization scheme to implement pixel-by-pixel nanophotonic optimization using a Green's function based formalism. The crucial insight in our proposal…
Inverse design of photonic devices with strict foundry fabrication constraints
Martin F. Schubert, Alfred K. C. Cheung, Ian A. D. Williamson +2
We introduce a new method for inverse design of nanophotonic devices which guarantees that resulting designs satisfy strict length scale constraints - including minimum width and s…
Arbitrary linear transformations for photons in the frequency synthetic dimension
Siddharth Buddhiraju, Avik Dutt, Momchil Minkov +2
Arbitrary linear transformations are of crucial importance in a plethora of photonic applications spanning classical signal processing, communication systems, quantum information p…
Inverse design of photonic crystals through automatic differentiation
Momchil Minkov, Ian A. D. Williamson, Lucio C. Andreani +5
Gradient-based inverse design in photonics has already achieved remarkable results in designing small-footprint, high-performance optical devices. The adjoint variable method, whic…
Integrated Nonreciprocal Photonic Devices with Dynamic Modulation
Ian A. D. Williamson, Momchil Minkov, Avik Dutt +3
Nonreciprocal components, such as isolators and circulators, are crucial components for photonic systems. In this article we review theoretical and experimental progress towards de…
Higher-order topological insulators in synthetic dimensions
Avik Dutt, Momchil Minkov, Shanhui Fan
Conventional topological insulators support boundary states that have one dimension lower than the bulk system that hosts them, and these states are topologically protected due to…
-Symmetric Topological Edge-Gain Effect
Alex Y. Song, Xiao-Qi Sun, Avik Dutt +6
We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the m…
Parallel fault-tolerant programming of an arbitrary feedforward photonic network
Sunil Pai, Ian A. D. Williamson, Tyler W. Hughes +4
Reconfigurable photonic mesh networks of tunable beamsplitter nodes can linearly transform -dimensional vectors representing input modal amplitudes of light for applications suc…
Forward-Mode Differentiation of Maxwell's Equations
Tyler W Hughes, Ian A D Williamson, Momchil Minkov +1
We present a previously unexplored forward-mode differentiation method for Maxwell's equations, with applications in the field of sensitivity analysis. This approach yields exact g…
Penetration depth reduction with plasmonic metafilms
Nathan Z. Zhao, Ian A. D. Williamson, Zhexin Zhao +2
In many optical systems, including metal films, dielectric reflectors, and photonic crystals, electromagnetic waves can experience evanescent decay. The spatial length scale of suc…
Wave Physics as an Analog Recurrent Neural Network
Tyler W. Hughes, Ian A. D. Williamson, Momchil Minkov +1
Analog machine learning hardware platforms promise to be faster and more energy-efficient than their digital counterparts. Wave physics, as found in acoustics and optics, is a natu…
Reprogrammable Electro-Optic Nonlinear Activation Functions for Optical Neural Networks
Ian A. D. Williamson, Tyler W. Hughes, Momchil Minkov +3
We introduce an electro-optic hardware platform for nonlinear activation functions in optical neural networks. The optical-to-optical nonlinearity operates by converting a small po…
High reflection from a one-dimensional array of graphene nanoribbons
Nathan Zhao, Zhexin Zhao, Ian Williamson +3
We show that up to 90% reflectivity can be achieved by using guided plasmonic resonances in a one-dimensional periodic array of plasmonic nanoribbon. In general, to achieve strong…
Broadband optical switch based on an achromatic photonic gauge potential in dynamically modulated waveguides
Ian A. D. Williamson, Shanhui Fan
We demonstrate that a photonic gauge potential, which arises from the phase degree of freedom in dynamic refractive-index modulation and hence is achormatic, can be used to achieve…
Zero-index bound states in the continuum
Momchil Minkov, Ian A. D. Williamson, Meng Xiao +1
Metamaterials with an effective zero refractive index associated to their electromagnetic response are sought for a number of applications in communications and nonlinear optics. A…
Adjoint method and inverse design for nonlinear nanophotonic devices
Tyler W. Hughes, Momchil Minkov, Ian A. D. Williamson +1
The development of inverse design, where computational optimization techniques are used to design devices based on certain specifications, has led to the discovery of many compact,…
Absence of unidirectionally propagating surface plasmon-polaritons in nonreciprocal plasmonics
Siddharth Buddhiraju, Yu Shi, Alex Song +5
In the presence of an external magnetic field, the surface plasmon polariton that exists at the metal-dielectric interface is believed to support a unidirectional frequency range n…
Fundamental limits to signal integrity in nonlinear parametric optical circulators
Ian A. D. Williamson, Zheng Wang
We characterize the response of a parametric nonlinear optical circulator to realistic signals that have finite bandwidths. Our results show that intermodulation distortion (IMD),…
Dual-carrier Floquet circulator with time-modulated optical resonators
Ian A. D. Williamson, S. Hossein Mousavi, Zheng Wang
Spatio-temporal modulation has shown great promise as a strong time-reversal symmetry breaking mechanism that enables integrated nonreciprocal devices and topological materials at…
Extraordinary wavelength reduction in terahertz graphene-cladded photonic crystal slabs
Ian A. D. Williamson, S. Hossein Mousavi, Zheng Wang
Photonic crystal slabs have been widely used in nanophotonics for light confinement, dispersion engineering, nonlinearity enhancement, and other unusual effects arising from their…
Kinetic inductance driven nanoscale 2D and 3D THz transmission lines
S. Hossein Mousavi, Ian A. D. Williamson, Zheng Wang
We examine the unusual dispersion and attenuation of transverse electromagnetic waves in the few-THz regime on nanoscale graphene and copper transmission lines. Conventionally, suc…