Aitor V. Velasco

Consejo Superior de Investigaciones Científicas

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Pavel Cheben

National Research Council Canada

David González‐Andrade

Centre de Nanosciences et de Nanotechnologies

Alejandro Ortega‐Moñux

Universidad de Málaga

Robert Halir

Universidad de Málaga

Jens H. Schmid

National Research Council Canada

ÍM

Íñigo Molina‐Fernández

Universidad de Málaga

José Manuel Luque‐González

Universidad de Málaga

J. Gonzalo Wangüemert‐Pérez

Universidad de Málaga

Alaine Herrero-Bermello

Consejo Superior de Investigaciones Científicas

Carlos Alonso‐Ramos

Centre de Nanosciences et de Nanotechnologies

Cooperative Institutions

Centre National de la Recherche Scientifique

National Research Council Canada

Universidad de Málaga

Université Paris-Sud

Centre de Nanosciences et de Nanotechnologies

Université Paris-Saclay

National Academies of Sciences, Engineering, and Medicine

Carleton University

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Consejo Superior de Investigaciones Científicas

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Achromatic subwavelength-assisted power splitter for next-generation silicon photonics

Raquel Fernández de Cabo Aitor V. Velasco Pavel Cheben David González‐Andrade

On-chip power splitters are fundamental building blocks in photonic integrated circuits. In this work, we use subwavelength metamaterials to engineer a 3-dB Y-junction power splitter exhibiting ultra-low excess loss of less than 0.3 dB over an unprecedented bandwidth of 700 nm (1300 – 2000 nm).

Achromatic lens

Splitter

Beam splitter

10.1109/siphotonics60897.2024.10544185

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Experimental demonstration of metamaterial anisotropy engineering for broadband on-chip polarization beam splitting

Optics Express (2020)

Alaine Herrero-Bermello A. Días José Manuel Luque‐González Alejandro Ortega‐Moñux Aitor V. Velasco

Subwavelength metamaterials exhibit a strong anisotropy that can be leveraged to implement high-performance polarization handling devices in silicon-on-insulator. Whereas these devices benefit from single-etch step fabrication, many of them require small feature sizes or specialized cladding materials. The anisotropic response of subwavelength metamaterials can be further engineered by tilting its constituent elements away from the optical axis, providing an additional degree of freedom in the design. In this work, we demonstrate this feature through the design, fabrication and experimental characterization of a robust multimode interference polarization beam splitter based on tilted subwavelength gratings. A 110-nm minimum feature size and a standard silicon dioxide cladding are maintained. The resulting device exhibits insertion loss as low as 1 dB, an extinction ratio better than 13 dB in a 120-nm bandwidth, and robust tolerances to fabrication deviations.

Extinction ratio

Cladding (metalworking)

Beam splitter

10.1364/oe.389070

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Citations (34)

Polarization and wavelength agnostic nanophotonic beam splitter

David González‐Andrade Christian Lafforgue Elena Durán‐Valdeiglesias Xavier Le Roux Mathias Berciano

High-performance optical beam splitters are of fundamental importance for the development of advanced silicon photonics integrated circuits. However, due to the high refractive index contrast of the silicon-on-insulator platform, state of the art Si splitters are hampered by trade-offs in bandwidth, polarization dependence and sensitivity to fabrication errors. Here, we present a new strategy that exploits modal engineering in slotted waveguides to overcome these limitations, enabling ultra-wideband polarization-insensitive optical power splitters, with relaxed fabrication tolerances. The proposed splitter relies on a single-mode slot waveguide which is transformed into two strip waveguides by a symmetric taper, yielding equal power splitting. Based on this concept, we experimentally demonstrate -3$\pm$0.5 dB polarization-independent transmission in an unprecedented 390 nm bandwidth (1260 - 1650 nm), even in the presence of waveguide width deviations as large as $\pm$25 nm.

Beam splitter

Splitter

Nanophotonics

Optical power

Waveguide

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Experimental demonstration of a broadband mode converter and multiplexer based on subwavelength grating waveguides

Optics & Laser Technology (2020)

David González‐Andrade A. Días J. Gonzalo Wangüemert‐Pérez Alejandro Ortega‐Moñux Íñigo Molina‐Fernández

Demultiplexer

Arrayed waveguide grating

10.1016/j.optlastec.2020.106297

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Citations (36)

Conversor y multiplexor de modos integrado

D. González-Andrade Aitor V. Velasco Pedro Corredera J. G. Wangüemert-Pérez Alejandro Ortega‐Moñux

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Recent Advances in Metamaterial Integrated Photonics

2022 IEEE Photonics Conference (IPC) (2019)

Pavel Cheben Jiřı́ Čtyroký Daniele Melati Yuri Grinberg Alejandro Ortega‐Moñux

Metamaterial engineered waveguide structures are emerging as fundamental building blocks for integrated photonics. Here we present an overview of our recent advances in this field, including fiber-chip couplers, ultra-broadband beam splitters, nanophotonic waveguides with engineered anisotropy and integrated Bragg filters.

10.1109/ipcon.2019.8908505

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Experimental Demonstration of Low-Uncertainty Calibration Methods for Bragg Grating Interrogators

Sensors (2018)

J. L. de Miguel Juan Galindo-Santos C. Pulido de Torres Pedro Salgado Aitor V. Velasco

In this paper we propose and demonstrate two alternative methods for the high-precision calibration of fiber Bragg grating (FBG) interrogators. The first method is based on the direct comparison between the wavelength measurements of the interrogator under test and a calibrated wavemeter, while analyzing a simulated symmetric Bragg grating constructed by a tunable filter and a fiber mirror. This first method is applicable to most commercial systems but presents an uncertainty limited by the spectral width and the wavelength stability of the tunable filter. The second method consists in measuring multiple reference absorption lines of calibrated absorption gas cells. This second method presents lower uncertainties, limited only by the optical resolution of the interrogator and the wavelength uncertainty of the reference cell absorption lines. However, it imposes more restrictive requirements on the interrogator software. Both methods were experimentally demonstrated by calibrating multiple commercial systems, reaching uncertainties down to 0.63 pm at a central wavelength of 1550 nm.

Fiber Bragg Grating

Spectral resolution

10.3390/s18061895

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Citations (3)

Extending the spectral operation of silicon power splitters through subwavelength nanotechnology

arXiv (Cornell University) (2024)

Raquel Fernández de Cabo David González‐Andrade Pavel Cheben Aitor V. Velasco

Power splitters play a crucial role in virtually all photonic circuits, enabling precise control of on-chip signal distribution. However, state-of-the-art solutions typically present trade-offs in terms of loss, bandwidth, and fabrication robustness, especially when targeting multimode operation. Here, we present a novel multimode 3-dB power splitter based on a symmetric Y-junction assisted by subwavelength grating metamaterials. The inclusion of the metamaterial structure circumvents the practical limitations of conventional Y-junction tips and realizes smooth modal transitions. Simulations for a standard 220-nm-thick silicon-on-insulator platform predict minimal excess loss (< 0.2 dB) for the fundamental and the first-order transverse-electric modes over an ultra-broad 700 nm bandwidth (1300-2000 nm). For the fundamental transverse-magnetic mode, losses are less than 0.3 dB in the 1300-1800 nm range. Experimental measurements validate these predictions in the 1430-1630 nm wavelength range, demonstrating losses < 0.4 dB for all three modes, even in the presence of fabrication deviations of up to \pm 10 nm. We believe that this device is suitable for the implementation of advanced photonic systems requiring high-performance distribution of optical signals.

10.48550/arxiv.2403.15781

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Subwavelength silicon photonic metamaterials for mode multiplexing and polarizationcontrol

Aitor V. Velasco David González‐Andrade Alaine Herrero-Bermello A. Días J. Gonzalo Wangüemert‐Pérez

Mode (computer interface)

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Deep-learning algorithms for imperfection-resilient Fourier-transform spectroscopy in silicon

Zindine Mokeddem Daniele Melati David González‐Andrade Thi Thuy Duong Dinh Miguel Montesinos‐Ballester

Silicon photonics spectrometers have great potential for applications in medicine and hazard detection. However, silicon spectrometers are very sensitive to fabrication imperfections and environmental conditions. Here, we study the use of deep-learning algorithms to improve tolerance of Fourier-transform spectrometers against fabrication imperfections and temperature variations.

Fourier transform spectroscopy

10.1109/gfp51802.2021.9673932

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