J. Gonzalo Wangüemert‐Pérez

Universidad de Málaga

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i-10 index

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Co-Authors

Alejandro Ortega‐Moñux

Universidad de Málaga

212

ÍM

Íñigo Molina‐Fernández

Universidad de Málaga

207

Pavel Cheben

National Research Council Canada

177

Robert Halir

Universidad de Málaga

168

Jens H. Schmid

National Research Council Canada

117

José Manuel Luque‐González

Universidad de Málaga

Alejandro Sánchez‐Postigo

Universidad de Málaga

Dan‐Xia Xu

National Research Council Canada

Miloš Nedeljković

University of Southampton

Jordi Soler Penadés

University of Southampton

Cooperative Institutions

Graz University of Technology

Universidad de Málaga

University of Southampton

National Research Council Canada

Centre National de la Recherche Scientifique

National Academies of Sciences, Engineering, and Medicine

Université Paris-Sud

Carleton University

Centre de Nanosciences et de Nanotechnologies

European Telecommunications Standards Institute

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Subwavelength-Grating Metamaterial Structures for Silicon Photonic Devices

Proceedings of the IEEE (2018)

Robert Halir Alejandro Ortega‐Moñux Daniel Benedikovič Goran Z. Mashanovich J. Gonzalo Wangüemert‐Pérez

Segmenting silicon waveguides at the subwavelength scale produce an equivalent homogenous material. The geometry of the waveguide segments provides precise control over modal confinement, effective index, dispersion and birefringence, thereby opening up new approaches to design devices with unprecedented performance. Indeed, with ever-improving lithographic technologies offering sub-100-nm patterning resolution in the silicon photonics platform, many practical devices based on subwavelength structures have been demonstrated in recent years. Subwavelength engineering has thus become an integral design tool in silicon photonics, and both fundamental understanding and novel applications are advancing rapidly. Here, we provide a comprehensive review of the state of the art in this field. We first cover the basics of subwavelength structures, and discuss substrate leakage, fabrication jitter, reduced backscatter, and engineering of material anisotropy. We then review recent applications including broadband waveguide couplers, high-sensitivity evanescent field sensors, low-loss devices for mid-infrared photonics, polarization management structures, spectral filters, and highly efficient fiber-to-chip couplers. We finally discuss the future prospects for subwavelength silicon structures and their impact on advanced device design.

Waveguide

Nanophotonics

10.1109/jproc.2018.2851614

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Citations (204)

Novel wideband six-port receiver structure

European Microwave Conference (2007)

P. Pérez-Lara I. Molina-Fernández J. Gonzalo Wangüemert‐Pérez A. González-Salguero J.A. Medina-Rodrı́guez

Typical six-port direct receiver (SPDR) comprise a six-port junction, made of power dividers and hybrids, and four matched power detectors. This kind of circuit is difficult to implement in MMIC (monolithic microwave integrated circuit) technology, due to its sensitivity to fabrication tolerances. Some simple six-port structures have been recently proposed which are more suitable for integration. However, these structures exhibit a direct path between LO and RF ports, which is undesirable for homodyne receiver operation. This work presents a novel and simple wideband SPDR with high isolation between LO and RF ports. Owing to its ease of implementation and high performance, it is a good candidate to be used in low-cost mass- market radio receivers.

Wideband

Port (circuit theory)

Direct-conversion receiver

RF front end

10.1109/eumc.2007.4405372

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Citations (3)

Group IV mid-infrared photonics

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2015)

Goran Z. Mashanovich Miloš Nedeljković Jordi Soler Penadés C. J. Mitchell Ali Z. Khokhar

In this paper we present SOI, suspended Si, and Ge-on-Si photonic platforms and devices for the mid-infrared. We demonstrate low loss strip and slot waveguides in SOI and show efficient strip-slot couplers. A Vernier configuration based on racetrack resonators in SOI has been also investigated. Mid-infrared detection using defect engineered silicon waveguides is reported at the wavelength of 2-2.5 μm. In order to extend transparency of Si waveguides, the bottom oxide cladding needs to be removed. We report a novel suspended Si design based on subwavelength structures that is more robust than previously reported suspended designs. We have fabricated record low loss Ge-on-Si waveguides, as well as several other passive devices in this platform. All optical modulation in Ge is also analyzed.

Cladding (metalworking)

Modulation (music)

Waveguide

10.1117/12.2176219

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Citations (4)

Subwavelength Grating Metamaterial Engineering: A New Tool for Silicon Photonics

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) (2018)

Alejandro Ortega‐Moñux José Manuel Luque‐González Alejandro Sánchez‐Postigo Robert Halir J. Gonzalo Wangüemert‐Pérez

Subwavelength gratings (SWGs) are periodic structures with a pitch smaller than half the wavelength of the propagating light, so they behave as an equivalent homogeneous birefringent metamaterial. SWGs have found innumerable applications in the field of integrated optics over the past ten years, most of them implemented in the Silicon-on-Insulator platform (SOI). In this talk we will summarize some of our recent contributions in the development of SWG waveguide devices for near and mid-infrared wavelengths.

Waveguide

10.1364/iprsn.2018.ith3j.4

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Subwavelength engineering in silicon photonics

Jens H. Schmid Pavel Cheben Dan‐Xia Xu Siegfried Janz J. Lapointe

Subwavelength engineering in silicon photonic integrated circuits is a powerful design tool that allows one to synthesize an effective photonic medium with adjustable refractive index. This creates a new degree of freedom in photonic circuit design. We present an overview of the fundamental concept and its application to address several important practical challenges in the implementation of silicon photonics as a next generation photonics platform for telecom, datacom and sensing. In particular, we report our results in developing highly efficient and broadband fiber-chip couplers for silicon photonic wire waveguides using subwavelength engineered edge coupling structures. We experimentally demonstrate a coupling efficiency of −0.4 dB and polarization independent operation for a broad spectral range exceeding 100 nm for optical fiber with a core diameter of 3.2 µm. For coupling to standard SMF-28 fiber with 10.4 µm mode field diameter we numerically demonstrate a subwavelength engineered overlayer structure composed of SiO 2 and Si 3 N 4 which exhibits an overall coupling efficiency exceeding 90%. We have also used our subwavelength structure for coupling experiments with a conventional In- GaAsP/InP buried heterostructure laser at λ = 1.3 µm with a measured near field mode size of 2.1 µm×2.8 µm. Peak coupling efficiency is 1.5 dB with 1-dB alignment tolerance of approximately ±1.2 µm horizontally and ±0.8 µm vertically. We further present subwavelength engineered grating couplers fabricated in a single-etch step for the telecom (1.55 µm) and datacom (1.3 µm) wavelengths with efficiencies exceeding −0.5 dB. Further applications that will be discussed include waveguide crossings, microspectrometers, ultra-fast optical switches, athermal waveguides, evanescent field sensors, polarization rotators and colorless interference couplers.

10.1109/piers.2016.7734470

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Slot-Coupled Multisection Quadrature Hybrid for UWB Applications

IEEE Microwave and Wireless Components Letters (2009)

Alvaro Moscoso‐Mártir J. Gonzalo Wangüemert‐Pérez Íñigo Molina‐Fernández Enrique Márquez‐Segura

We present a three-section quadrature hybrid based on slot-coupled directional couplers, which operates over a bandwidth from 3.1 to 10.6 GHz. A prototype has been fabricated which exhibits a return loss better than 20 dB, isolation around 20 dB, an amplitude imbalance between output ports of less than plusmn0.75 dB and a phase imbalance between +1 ^deg and -3 ^deg across the 3.1-10.6 GHz band. This design outperforms previously reported results for ultra wide band operation.

Quadrature (astronomy)

Return loss

X band

10.1109/lmwc.2009.2013700

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Citations (38)

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)

Diseño de grating couplers de orden cero de banda ancha y alta eficiencia para el infrarrojo medio

Alejandro Sánchez‐Postigo J. Gonzalo Wangüemert‐Pérez José Manuel Luque‐González Íñigo Molina‐Fernández Pavel Cheben

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Diffractive sidewall grating coupler: towards 2D free-space optics on chip

Abdelfettah Hadij‐ElHouati Pavel Cheben Alejandro Ortega‐Moñux J. Gonzalo Wangüemert‐Pérez Robert Halir

Silicon photonics has been the subject of intense research efforts. In order to implement complex integrated silicon photonic devices and systems, a wide range of robust building blocks is needed. Waveguide couplers are fundamental devices in integrated optics, enabling different functionalities such as power dividers, spot-size converters, coherent hybrids and fiber-chip coupling interfaces, to name a few. In this work we propose a new type of nanophotonic coupler based on sidewall grating (SIGRA) concept. SIGRAs have been used in the Bragg regime, for filtering applications, as well as in the sub-wavelength regime in multimode interference (MMI) couplers. However, the use of SIGRAs in the radiation regime has been very limited. Specifically, a coarse wavelength division multiplexer was proposed and experimentally validated. In this work we study the use of SIGRAs in the diffractive regime as a mean to couple the light between a silicon wire waveguide mode and a continuum of slab waveguide modes. We also propose an original technique for designing SIGRA based couplers, enabling the synthesis of arbitrary radiation field profile by Floquet- Bloch analysis of individual diffracting elements while substantially alleviating computational load. Results are further validated by 3D FDTD simulations which confirm that the radiated field profile closely matches the target design field.

Waveguide

Coupled mode theory

Nanophotonics

10.1117/12.2522471

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Citations (1)

Engineering sub-wavelength silicon waveguides for sensing applications in the near-infrared and mid-infrared band

J. Gonzalo Wangüemert‐Pérez Alejandro Sánchez‐Postigo Abdelfettah Hadij‐ElHouati Jonas Leuermann Carlos Pérez-Armenta

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