Publications related to Gradient-index optics

Gain enhancement of circular waveguide antennas using near-zero index metamaterials

Kosmas Tsakmakidis, Ershad Mohammadi, Foziyeh Sohrabi

In this article, a rigorous analytical methodology is introduced for designing near-zero refractive index metamaterials (NZIMs). Our proposed NZIM media is realized by three stacked layers of perforated metallic surfaces, each layer composed of a fishnet-l ...

WILEY2019

Design and implementation of quasi-optical components for the upgrade of the TCV EC-system

Timothy Goodman, Stefano Alberti, Jean-Philippe Hogge, Laurie Porte, Matthieu Toussaint, Florian Ramseyer

The EC-system of the TCV tokamak is progressively being upgraded with the addition of two MW-class dual-frequency gyrotrons (84 and 126 GHz/2s/1MW). In order to connect the two gyrotrons to the existing low field side and top launchers, new waveguide routi ...

ELSEVIER SCIENCE SA2019

Leveraging wafer-level manufacturing process limitations to increase large scale fused silica microlens array uniformity

Toralf Scharf, Wilfried Noell, Raoul Kirner, Jeremy Béguelin

The wafer-level production of Fused Silica microlens arrays is limited by systematic process non-uniformities. The common molten resist-reflow process with subsequent dry-etching allows for manufacturing of microlens arrays on 200 mm wafers. A thorough pro ...

SPIE-INT SOC OPTICAL ENGINEERING2019

Two-photon imaging and selective laser ablation of Cochlea hair cells through a multimode fiber probe

Demetri Psaltis, Christophe Moser, Damien Claude-Marie Loterie, Eirini Kakkava, Marilisa Romito

We demonstrate multimode fiber probe that accomodates dual modality properties for high power ultrashort pulse delivery. A commercially available multimode graded-index (GRIN) fiber is used for two-photon imaging and/or femtosecond laser ablation of Cochle ...

SPIE-INT SOC OPTICAL ENGINEERING2019

The Influence of Microstructure on Nanomechanical and Diffusion Barrier Properties of Thin PECVD SiOx Films Deposited on Parylene C Substrates

Ivo Furno, Yves Leterrier, Matthias Van Gompel, David Framil Carpeno

Plasma-enhanced chemical vapor deposition (PECVD) was used to deposit SiOx thin films of varying thicknesses on parylene C substrates, using hexamethyldisiloxane (HMDSO) as a precursor. The microstructure of SiOx coatings was analyzed using X-ray photoemis ...

FRONTIERS MEDIA SA2019

Stepwise Luneburg Lens for Bloch Surface Waves

Myun Sik Kim, Babak Vosoughi Lahijani

In order to enlarge the capability for in-plane manipulation of the Bloch surface wave (BSW), we investigate 2D gradient index (GRIN) optical components using a finite-difference time-domain (FDTD) numerical method. To ease difficulties in fabrication to a ...

2018

Tomographic imaging with harmonic holography in tissues of known refractive index distribution

Demetri Psaltis, Ye Pu

High-resolution imaging in thick biological tissues beyond a few transport mean free path of photons remains a formidable challenge to modern science and technology. Recent advancements in optical tomography have enabled the reconstruction of the three-dim ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Wavefront shaping for ultrashort pulse delivery through optical fibers for imaging and ablation

Demetri Psaltis, Christophe Moser, Damien Claude-Marie Loterie, Eirini Kakkava, Nicolino Stasio, Donald Benjaman Conkey

We demonstrate high power ultrashort pulse delivery through a commercially available multicore fiber (MCF) and a multimode graded-index fiber (GRINF) for imaging and laser ablation. Lensless focusing and digital scanning of ultrashort pulses through the op ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Bloch Surface Waves Using Graphene Layers: An Approach toward In-Plane Photodetectors

Hans Peter Herzig, Myun Sik Kim, Richa Dubey, Babak Vosoughi Lahijani

A dielectric multilayer platform was investigated as a foundation for two-dimensional optics. In this paper, we present, to the best of our knowledge, the first experimental demonstration of absorption of Bloch surface waves in the presence of graphene lay ...

2018

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Gradient-index optics

Gain enhancement of circular waveguide antennas using near-zero index metamaterials

Design and implementation of quasi-optical components for the upgrade of the TCV EC-system

Leveraging wafer-level manufacturing process limitations to increase large scale fused silica microlens array uniformity

Two-photon imaging and selective laser ablation of Cochlea hair cells through a multimode fiber probe

The Influence of Microstructure on Nanomechanical and Diffusion Barrier Properties of Thin PECVD SiOx Films Deposited on Parylene C Substrates

Stepwise Luneburg Lens for Bloch Surface Waves

Tomographic imaging with harmonic holography in tissues of known refractive index distribution

Wavefront shaping for ultrashort pulse delivery through optical fibers for imaging and ablation

Bloch Surface Waves Using Graphene Layers: An Approach toward In-Plane Photodetectors

Study of the Angular Spectrum of a Bianisotropic Refractive Metasurface at a Dielectric Interface

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Stepwise Luneburg Lens for Bloch Surface Waves

Tomographic imaging with harmonic holography in tissues of known refractive index distribution

Wavefront shaping for ultrashort pulse delivery through optical fibers for imaging and ablation

Study of the Angular Spectrum of a Bianisotropic Refractive Metasurface at a Dielectric Interface

Bloch Surface Waves Using Graphene Layers: An Approach toward In-Plane Photodetectors

Gain enhancement of circular waveguide antennas using near-zero index metamaterials

Design and implementation of quasi-optical components for the upgrade of the TCV EC-system

Two-photon imaging and selective laser ablation of Cochlea hair cells through a multimode fiber probe

Leveraging wafer-level manufacturing process limitations to increase large scale fused silica microlens array uniformity

The Influence of Microstructure on Nanomechanical and Diffusion Barrier Properties of Thin PECVD SiOx Films Deposited on Parylene C Substrates