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Halir R.,University of Malaga | Halir R.,Bionand Center for Nanomedicine and Biotechnology | Vivien L.,CNRS Fundamental Electronics Institute | Le Roux X.,CNRS Fundamental Electronics Institute | And 2 more authors.
IEEE Photonics Journal | Year: 2013

Integrated optical affinity sensors based on Mach-Zehnder interferometers (MZIs) enable sensitive and label-free detection of chemical and biological molecules. However, since MZIs transduce optical phase changes into sinusoidal intensity variations, they exhibit a variable sensitivity that vanishes at the extrema of the transmittance function. Moreover, the direction of phase change cannot be unambiguously determined with these sensors. Here, we present a coherent detection scheme based on integrated optics that enables unambiguous readout of the optical phase with a constant sensitivity. Our approach furthermore cancels the effect of imperfections in the sensor hardware using a blind calibration scheme. We experimentally show completely linear readout of the optical phase, with a fourfold enhancement of average sensitivity compared to conventional detection. © 2013 IEEE. Source


Halir R.,University of Malaga | Halir R.,Bionand Center for Nanomedicine and Biotechnology | Bock P.J.,CMC Microsystems | Cheben P.,National Research Council Canada | And 10 more authors.
Laser and Photonics Reviews | Year: 2015

Periodic structures with a sub-wavelength pitch have been known since Hertz conducted his first experiments on the polarization of electromagnetic waves. While the use of these structures in waveguide optics was proposed in the 1990s, it has been with the more recent developments of silicon photonics and high-precision lithography techniques that sub-wavelength structures have found widespread application in the field of photonics. This review first provides an introduction to the physics of sub-wavelength structures. An overview of the applications of sub-wavelength structures is then given including: anti-reflective coatings, polarization rotators, high-efficiency fiber-chip couplers, spectrometers, high-reflectivity mirrors, athermal waveguides, multimode interference couplers, and dispersion engineered, ultra-broadband waveguide couplers among others. Particular attention is paid to providing insight into the design strategies for these devices. The concluding remarks provide an outlook on the future development of sub-wavelength structures and their impact in photonics. © 2014 The Authors. Laser & Photonics Reviews published by Wiley-VCH Verlag GmbH & Co. KGaA Weinheim. Source


Wanguemert-Perez J.G.,University of Malaga | Cheben P.,National Research Council Canada | Ortega-Monux A.,University of Malaga | Ortega-Monux A.,Bionand Center for Nanomedicine and Biotechnology | And 8 more authors.
Optics Letters | Year: 2014

We explore, to the best of our knowledge, the potential of diffractionless subwavelength grating waveguides for sensing applications. We show that by subwavelength patterning of silicon-wire waveguides the field delocalization can be engineered to increase the sensitivity. Fully vectorial 3D-FDTD simulations confirm the sensitivity enhancement, achieving sensitivities of 0.83 RIU/RIU and 1.5 · 10-3 RIU/nm for bulk and surface sensing, respectively, which compare favorably to state-of-the-art sensing waveguides. © 2014 Optical Society of America. Source


Halir R.,University of Malaga | Halir R.,Bionand Center for Nanomedicine and Biotechnology | Ortega-Monux A.,University of Malaga | Ortega-Monux A.,Bionand Center for Nanomedicine and Biotechnology | And 10 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2014

As most integrated optics platforms, silicon offers only a fixed set of material refractive indices for designing devices. The ability of sub-wavelength patterned structures to synthesize arbitrary equivalent index values between nSi ~ 3.5 and nair = 1 has thus enabled completely new design approaches that have led to silicon waveguide devices with breakthrough performance. This review covers the latest advances in sub-wavelength structured fiber-to-chip grating couplers and multimode interference couplers. We discuss, among others, single-etch grating couplers with high coupling efficiency -1.8 dB), and broad bandwidth (115 nm at 3 dB), as well as ultra-short, high performance multi-mode interference couplers. We furthermore introduce the concept of dispersion engineering with sub-wavelength structures, showing its potential to increase the bandwidth of waveguide devices, including multi-mode interference couplers covering a 450 nm wavelength span. © 1995-2012 IEEE. Source

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