2017 Session T7: Photonic Sensors, Chair: Hon Tsang

Integrated III-V Photonic Crystal – Si waveguide platform with tailored Optomechanical coupling

Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N Marcoussis, 91460 Marcoussis, France Université Paris Diderot, Sorbonne Paris Cité, 75207 Paris Cedex 13, France

Optomechanical systems, in which the vibrations of a mechanical resonator are coupled to an electromagnetic radiation, have permitted the investigation of a wealth of novel physical effects. Typically for the most of these systems, optomechanical coupling originates from a dispersive dependence of the nanocavity resonance frequency on its geometry, which is modulated by mechanical motion. Dissipative optomechanical coupling consists in the modulation of the lifetime of the cavity photons through the motion of a mechanical oscillator. Very recently, it has been demonstrated that this effect is observed in a wide variety of devices. Dissipative couplings may significantly enhance the detection sensitivity in optomechanically-based sensing schemes and open new possibilities in optomechanical control with systems featuring both types of coupling mechanisms, where a tailored coupling strength is highly desired.


Evanescent Field based Optofluidic Platform in TriPleX for Sensitive Absorbance Detection of Chromophores

LioniX BV, Hengelosestraat 500, Enschede, 7521 AN, The Netherlands

Integrated-optical chemical sensors are attractive candidates for low sample volume applications as they can be miniaturized rather easily and offer a high intrinsic sensitivity. Part of the transduction mechanism is the very local probing of the relevant optical parameters of the sample by the evanescent field component of the propagating light at the boundary between waveguide core and sample in the region of the so-called sensing window. In this very region, the waveguide core directly contacts the applied sample. The modified Lambert-Beer formula states the relation between the evanescent wave absorbance A (=logP0/P, with P0 and P the optical power output measured for the reference and the sample, respectively) and the concentration of the light absorbing species c by considering the evanescent wave modal fraction σ (present within the sample domain), the molar absorption coefficient ε and the path length l (Eq. 1, left part). From this it can be derived easily that the sensitivity of the measurement A/c is determined by l as well as σ (Eq. 1, right part).


Silicon Photonics and its Applications in Life Science

Roel Baets
Ghent University – imec, Photonics Research Group, Technologiepark-Zwijnaarde 15, 9052 Gent, Belgium
Ghent University, Center for Nano- and Biophotonics, Belgium

With the technology of silicon photonics gaining maturity there is a tendency to consider it as a generic technology that can serve a diverse range of markets, not only in datacom and telecom, but also in sensors, biosensors and biomedical instruments. The driver is always the same: create compact and low-cost integrated circuits with a functionality and performance at par with otherwise bulky and costly implementations. Examples of this trend include PIC’s for sensing bioparticles such as proteins and DNA, PIC’s for spectroscopic detection of various molecules (glucose, ammonia, markers for food spoilage etc), PIC’s for optical coherence tomography or for laser Doppler vibrometry.


On-chip Enhanced Raman spectroscopy using metal slot waveguide

Ali Raza, Pieter Wuytens, Frederic Peyskens, Pol Van Dorpe, Stephane Clemmen and Roel Baets
Photonics Research Group, Ghent University – imec, 9052 Ghent, Belgium Center for Nano- and Biophotonics (NB-Photonics), Ghent University,
9052 Ghent, Belgium
Department of Electrical Engineering & Computer Science, MIT, Massachusetts 02139, USA
Department of Molecular Biotechnology, Ghent University,
B-9000 Ghent, Belgium
IMEC, Kapeldreef 75, 3001 Heverlee, Belgium
Corresponding author ali.raza@ugent.be

Surface enhanced Raman scattering (SERs) is a technique that facilitates Raman spectroscopy of challenging samples such as thin layers, dilute solutions, or nanoparticles in a low concentration. SERS relies on localized plasmonic resonances that arise at ultra-small metallic gaps, tips or edges from a rough metallic surface, or an engineered nanostructure (antenna). Those plasmons lead to orders of magnitude of field enhancement but in a volume limited to a radius of 10-50 nm. However, plasmonic enhancement doesn’t require a resonance. Propagating surface plasmon polaritons are electronic excitations that propagate in the metal over relatively long distances (several microns) while still enabling a large field enhancement. Here, we use it to increase the Raman scattering in a hybrid photonic-plasmonic structure whose centrepiece is a metallic slot waveguide.


Rare-earth doped selenides active waveguides for integrated mid-infrared sensing applications

Loïc BODIOU, Jonathan LEMAITRE, Aldo GUTIERREZ-ARROYO, Walid EL AYED, Yannick DUMEIGE, Isabelle HARDY, Joel CHARRIER, Florent STARECKI, Emeline BAUDET, Radwan CHAHAL, Virginie NAZABAL, Jean-Louis DOUALAN, Alain BRAUD, Patrice CAMY, Petr NEMEC
F-22305 Lannion Cedex, France
ISCR, UMR-CNRS 6226, Glass and Ceramics Team, 35042 Rennes, France
CIMAP, UMR CEA-CNRS-ENSICaen, Université de Caen, 14050 Caen, France
Department of Graphic Arts and Photophysics, Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice, Czech Republic

Mid-infrared (mid-IR) absorption spectroscopic techniques can provide inherent molecular selectivity and reach very low detection limits. They have therefore found applications in environmental, health or security domains. In parallel to the growing demand for the detection of traces molecules, the development of compact sensors is also urged to extend the operational range of these sensors to on-site measurements. Sophisticated on-chip mid-IR transducers have been implemented using different integrated optical platforms (Si, Ge, SiNx, arsenides, chalcogenides…). However, despite the versatility of light sources spanning the whole mid-IR (synchrotron, globar, optical parametric oscillator, quantum/interband cascade laser (QCL/ICL) or supercontinuum sources), on-chip integration of mid-IR broadband light sources still remains a challenge. In particular, integrated broadband light sources and amplifiers operating in the 3-5 µm window would be of great interest as this spectral range overlaps an Earth’s atmosphere transmission window and strong characteristic vibrational transitions displayed by chemical molecules such as hydrocarbons, carbon dioxide and carbon monoxide (Fig.1a).