Insight From Darkness: Nanophotonics for Real-Time Phase Imaging

Real-Time Phase Imaging with an Asymmetric Transfer Function Metasurface

L Wesemann, J Rickett, TJ Davis, A Roberts

2022-05-18

The conversion of phase variations in an optical wavefield into intensity information is of fundamental importance for optical ima..

Nanophotonics enhanced coverslip for phase imaging in biology

L Wesemann, J Rickett, J Song, J Lou, E Hinde, TJ Davis, A Roberts

2021-12-01

The ability to visualise transparent objects such as live cells is central to understanding biological processes. Here we experime..

Meta-optical and thin film devices for all-optical information processing

Lukas Wesemann, Timothy J Davis, Ann Roberts

2021-09-01

All-optical spatial frequency filtering has a long history with many applications now commonly replaced with digital alternatives...

Near-Perfect Absorption of Light by Coherent Plasmon-Exciton States

DE Gómez, X Shi, T Oshikiri, A Roberts, H Misawa

2021-05-12

We experimentally demonstrate and theoretically study the formation of coherent plasmon-exciton states which exhibit absorption of..

Nanophotonic systems for image processing

L Wesemann, T Davis, A Roberts

2021-01-01

Optical Metasurfaces for Processing of Amplitude and Phase Images

Lukas Wesemann, Jon Rickett, Jingchao Song, Timothy J Davis, Ann Roberts

2021-01-01

We investigate the utilization of plasmonic resonant waveguide gratings for all-optical image processing in transmission. We exper..

Self-Assembly of Plasmonic Near-Perfect Absorbers of Light: The Effect of Particle Size

Gus O Bonin, Steven J Barrow, Timothy U Connell, Ann Roberts, Anthony SR Chesman, Daniel E Gomez

2020-10-01

Structures capable of perfect light absorption promise technological advancements in varied applications, including sensing, optoe..

Towards Nanophotonic All-optical Image Processing

Lukas Wesemann

2020-01-01

The processing of spatial information, including images, is fundamental in modern scientific, industrial and medical applications...

Selective near-perfect absorbing mirror as a spatial frequency filter for optical image processing

Lukas Wesemann, Evgeniy Panchenko, Kalpana Singh, Enrico Della Gaspera, Daniel E Gomez, Timothy J Davis, Ann Roberts

2019-10-01

Spatial frequency filtering is a fundamental enabler of information processing methods in biological and technical imaging. Most f..

Ultracompact Camera Pixel with Integrated Plasmonic Color Filters

Evgeniy Panchenko, Lukas Wesemann, Daniel E Gomez, Timothy D James, Timothy Davis, Ann Roberts

2019-09-17

Photodetector size imposes a fundamental limit on the amount of information that can be recorded by an image sensor. Compact, high..

Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence

Chen Liu, Michael Malek, Ivan Poon, Lanzhou Jiang, Arif M Siddiquee, Colin JR Sheppard, Ann Roberts, Harry Quiney, Douguo Zhang, Xiaocong Yuan, Jiao Lin, Christian Depeursinge, Pierre Marquet, Shan Shan Kou

2019-09-01

We report a dual-contrast method of simultaneously measuring and visualizing the volumetric structural information in live biologi..

Metasurfaces with Asymmetric Optical Transfer Functions for Optical Signal Processing

TJ Davis, F Eftekhari, DE Gómez, A Roberts

2019-07-01

Metasurface thin films created from arrays of structured optical elements have been shown to perform spatial filtering of optical ..

Plasmonic Near-Complete Optical Absorption and Its Applications

Charlene Ng, Lukas Wesemann, Evgeniy Panchenko, Jingchao Song, Timothy J Davis, Ann Roberts, Daniel E Gomez

2019-07-01

Near-complete absorption of light has the potential to underpin advances in photodetection, advanced chemistry, coloration of mate..

Large-Area Nanofabrication of Partially Embedded Nanostructures for Enhanced Plasmonic Hot-Carrier Extraction

Charlene Ng, Peng Zeng, Julian A Lloyd, Debadi Chakraborty, Ann Roberts, Trevor A Smith, Udo Bach, John E Sader, Timothy J Davis, Daniel E Gomez

2019-03-01

When plasmonic nanoparticles are coupled with semiconductors, highly energetic hot carriers can be extracted from the metal-semico..

Plasmene Metasurface Absorbers: Electromagnetic Hot Spots and Hot Carriers

Qianqian Shi, Timothy U Connell, Qi Xiao, Anthony SR Chesman, Wenlong Cheng, Ann Roberts, Timothy J Davis, Daniel E Gomez

2019-02-01

Light-matter interactions are extremely important, as they sustain life on Earth and can be tailored for diverse applications in a..

Plasmonic Metasurfaces for Optical Information Processing

L Wesemann, E Panchenko, K Singh, DE Gomez, TJ Davis, A Roberts

2019-01-01

Optical spatial frequency filtering is a key method for information processing in biological and technical imaging. While conventi..

Tuning the asymmetric response of metasurfaces for optical spatial filtering

Timothy J Davis, Fatima Eftekhari, Daniel E Gomez, Ann Roberts

2019-01-01

The spatial filtering of optical signals has been demonstrated previously with metasurface thin-films created from arrays of struc..

Hot-Carrier Organic Synthesis via the Near-Perfect Absorption of Light

Qi Xiao, Timothy U Connell, Jasper J Cadusch, Ann Roberts, Anthony SR Chesman, Daniel E Gomez

2018-11-01

Photocatalysis enables the synthesis of valuable organic compounds by exploiting photons as a chemical reagent. Although light abs..

Metasurfaces, dark modes, and high NA illumination

Lukas Wesemann, Panji Achmari, Kalpana Singh, Evgeniy Panchenko, Timothy D James, Daniel E Gomez, Timothy J Davis, Ann Roberts

2018-10-15

The interaction of a focused beam with a metasurface supporting dark modes is investigated. We show computationally and experiment..

Optical image processing with metasurface dark modes

A Roberts, DE Gómez, TJ Davis

2018-09-01

Here we consider image processing using the optical modes of metasurfaces with an angle-dependent excitation. These spatially disp..

Metasurface-integrated Fully CMOS-compatible Phase Gradient Photodetector

E Panchenko, L Wesemann, TJ Davis, DE Gomez, A Roberts

2018-08-06

Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

K Singh, E Panchenko, B Nasr, A Liu, L Wesemann, TJ Davis, A Roberts

2018-01-01

Here we present the results of an investigation of resonances of azimuthal trimer arrangements of rectangular slots in a gold film..

In-Plane Detection of Guided Surface Plasmons for High-Speed Optoelectronic Integrated Circuits

E Panchenko, JJ Cadusch, O Avayu, T Ellenbogen, TD James, D Gómez, A Roberts

2018-01-01

Constrains on the speed of modern digital integrated circuits are dominated by the metallic interconnects between logic gates. Sur..

Metasurface-integrated fully CMOS-compatible phase gradient photodetector

E Panchenko, L Wesemann, TJ Davis, DE Gómez, A Roberts

2018-01-01

Here we present a fully CMOS compatible photodetector with embedded plasmonic metasurfaces capable of detecting a local phase grad..

Nanophotonic approaches to optical information processing

L Wesemann, K Singh, E Panchenko, DE Gomez, TJ Davis, A Roberts

2018-01-01

We discuss the potential use of nanophotonics in compact optical information processing systems and present recent progress in the..

Luminescence of a Transition Metal Complex Inside a Metamaterial Nanocavity

Timothy U Connell, Stuart K Earl, Charlene Ng, Ann Roberts, Timothy J Davis, Jonathan M White, Anastasios Polyzos, Daniel E Gomez

2017-08-25

Modification of the local density of optical states using metallic nanostructures leads to enhancement in the number of emitted qu..

Plasmonic Edge States: An Electrostatic Eigenmode Description

DE Gómez, Y Hwang, J Lin, TJ Davis, A Roberts

2017-07-19

We consider periodic arrangements of metal nanostructures and study the effect of periodicity on the localized surface plasmon res..

Characterization of the coherence properties of different optical sources

A Celine Kavida, A Roberts

2017-07-01

Non-interferometric phase-space tomography is used to characterize the spatial coherence properties of scalar quasi-monochromatic ..

Colloquium: An algebraic model of localized surface plasmons and their interactions

TJ Davis, DE Gómez

2017-01-30

Although localized surface plasmons in metal nanoparticles can be modeled by Maxwells equations, the difficulty in solving them fo..

Dark mode metasurfaces: Sensing optical phase difference with subradiant modes and Fano resonances

A Roberts, TJ Davis, DE Gomez

2017-01-01

We computationally investigate the excitation of subradiant modes and Fano resonances of arrays of simple antenna elements with su..

Plasmonic circuits for manipulating optical information

TJ Davis, DE Gómez, A Roberts

2017-01-01

Surface plasmons excited by light in metal structures provide a means for manipulating optical energy at the nanoscale. Plasmons a..

Plasmonics-enabled metal-semiconductor-metal photodiodes for high-speed interconnects and polarization sensitive detectors

Evgeniy Panchenko, Jasper J Cadusch, Timothy D James, Ann Roberts

2017-01-01

Metal-semiconductor-metal (MSM) photodiodes are commonly used in ultrafast photoelectronic devices. Re- cently it was shown that l..

Photoinduced Electron Transfer in the Strong Coupling Regime: Waveguide-Plasmon Polaritons

P Zeng, J Cadusch, D Chakraborty, TA Smith, A Roberts, JE Sader, TJ Davis, DE Gómez

2016-04-13

Reversible exchange of photons between a material and an optical cavity can lead to the formation of hybrid light-matter states wh..

Modified stripe waveguide design for plasmonic input port structures

E Panchenko, TD James, A Roberts

2016-01-01

We present a modified asymmetric stripe plasmonic waveguide design for plasmonic integrated input port structures. Such a waveguid..