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Perfectly vertical surface grating couplers using subwavelength engineering for increased feature sizes

Mohsen Kamandar Dezfouli, Yuri Grinberg, Daniele Melati, Pavel Cheben, Jens H. Schmid, Alejandro Sánchez-Postigo, Alejandro Ortega-Moñux, Gonzalo Wangüemert-Pérez, Ross Cheriton, Siegfried Janz, and Dan-Xia Xu
Opt. Lett. 45(13) 3701-3704 (2020)

Strip-pair comparison method for building threshold color-difference model: theoretical model validation

Fernando Brusola, Ignacio Tortajada, Ismael Lengua, Begoña Jordá, and Guillermo Peris-Fajarnés
Opt. Express 28(14) 21336-21347 (2020)

Photonic generation of a parabolic-shaped microwave signal and dual-linear-chirp microwave waveform

Ritesh Kumar and Sanjeev Kumar Raghuwanshi
Appl. Opt. 59(20) 6024-6029 (2020)

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Spotlight on Optics
Hyperpolarizability dispersion measured for CS2 vapor
Summary by Heribert Reis

This work solves the long-standing conundrum of the correct experimental value for the second hyperpolarizability of...

In situ optical backpropagation training of diffractive optical neural networks
Summary by Daniel Brunner

After their breakthrough around a decade ago, neural networks electrify and transform computer science, engineering,...

The non-diffracting nature of truncated Hermite–Gaussian beams
Summary by Brynmor Davis

Established families of standard beam profiles are extremely useful when characterizing the propagation of light; and...

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