Probing molecular absorption under slow-light propagation using a photonic crystal waveguide

Dicaire, Isabelle; Rossi, Alfredo De; Combrié, Sylvain; Thévenaz, Luc

doi:10.1364/ol.37.004934

Cited by 23 publications

(15 citation statements)

References 12 publications

(4 reference statements)

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“…This result also shows that the enhancement of the nonlinear effects reported before were a result of the experimental configuration -the pulse is injected into a finite length nonlinear media, and the nonlinear effect is measured at the output. Thus, unlike many previous claims, light-matter interactions are not enhanced in the slow/stopped light regimes, and the observed enhancements of the (linear and) nonlinear effects is unrelated to the source of the strong dispersion, be it material or structural dispersion [78,79]. An alternative experimental configuration where the absorption or nonlinearity are measured in systems with different group velocities for the same duration is expected to show the insensitivity to the group velocity we predict here.…”

Section: Scaling With the Group Velocitycontrasting

confidence: 50%

Pulse propagation in the slow and stopped light regime

Weiss

Sivan

2018

Opt. Express

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Electromagnetic pulse propagation in the slow light regime and near a zero group velocity point is relevant to a plethora of potential applications, and has analogies in numerous other wave systems. Unfortunately, the standard frequency-based formulation for pulse propagation is unsuitable for describing the dynamics in such regimes, due to the divergence of the dispersion coefficients. Moreover, in the presence of absorption, it is not clear how to interpret the propagation dynamics due to the drastic change induced by absorption upon the dispersion curves. As a remedy, we present an alternative momentum-based formulation, which is rapidly converging in these regimes, and naturally suitable for lossy and nonlinear media. It is specialized to a waveguide geometry which provides a significant simplification with respect to existing momentum-based schemes. Doing so, we provide a somewhat alternative, yet intuitive picture of the seeming enhanced absorption and nonlinear response in these regimes, and show that light-matter interactions are not enhanced in the slow/stopped light regimes.

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Section: Scaling With the Group Velocitycontrasting

confidence: 50%

Pulse propagation in the slow and stopped light regime

Weiss

Sivan

2018

Opt. Express

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“…The importance of the latter was demonstrated experimentally in absorption-type measurements 24 . Equation (1) agrees with the result of a perturbative analysis 25 .…”

Section: Resultsmentioning

confidence: 91%

Slow-light-enhanced gain in active photonic crystal waveguides

Lunnemann

Chen

et al. 2014

Nat Commun

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Passive photonic crystals have been shown to exhibit a multitude of interesting phenomena, including slow-light propagation in line-defect waveguides. It was suggested that by incorporating an active material in the waveguide, slow light could be used to enhance the effective gain of the material, which would have interesting application prospects, for example enabling ultra-compact optical amplifiers for integration in photonic chips. Here we experimentally investigate the gain of a photonic crystal membrane structure with embedded quantum wells. We find that by solely changing the photonic crystal structural parameters, the maximum value of the gain coefficient can be increased compared with a ridge waveguide structure and at the same time the spectral position of the peak gain be controlled. The experimental results are in qualitative agreement with theory and show that gain values similar to those realized in state-of-the-art semiconductor optical amplifiers should be attainable in compact photonic integrated amplifiers.

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“…To go around this difficulty, the fiber-optic sensors of liquids developed to date either rely on hollow-core, photonic crystal fibers (PCFs) [5][6][7][8] or involve considerable structural modifications of standard fibers. Specific forms of the latter include long-period fiber Bragg gratings for the excitation of cladding modes [9], etching or polishing fibers down to the core [10,11], tapering fibers down to few-microns diameters [12], the application of transducer coating layers [13], the fabrication of inline cavities [14], and the use of cleaved facets [15,16].…”

Section: Introductionmentioning

confidence: 99%

Optomechanical sensing of liquids outside standard fibers using forward stimulated Brillouin scattering

Antman¹,

Clain²,

London³

et al. 2016

Optica

158

186

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The analysis of chemical species is one of the most fundamental and long-standing challenges in fiber-optic sensors research. Existing sensor architectures require a spatial overlap between light and the substance being tested and rely either on structural modifications of standard fibers or on specialty photonic crystal fibers. In this work, we report an optomechanical fiber sensor that addresses liquids outside the cladding of standard, 8/125 μm single-mode fibers with no structural intervention. Measurements are based on forward stimulated Brillouin scattering by radial, guided acoustic modes of the fiber structure. The acoustic modes are stimulated by an optical pump pulse and probed by an optical signal wave, both confined to the core. The acoustic vibrations induce a nonreciprocal phase delay to the signal wave, which is monitored in a Sagnac interferometer loop configuration. The measured resonance frequencies and excitation strengths of individual modes agree with the predictions of a corresponding quantitative analysis. The acoustic reflectivity at the outer cladding boundary and the acoustic impedance of the surrounding medium are extracted from cavity lifetime measurements of multiple modes. The acoustic impedances of deionized water and ethanol are measured with better than 1% accuracy. The measurements successfully distinguish between aqueous solutions with 0, 4%, 8%, and 12% concentrations of dissolved salt. The new fiber-sensing paradigm might be used in the monitoring of industrial processes involving ionic solutions.

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Probing molecular absorption under slow-light propagation using a photonic crystal waveguide

Cited by 23 publications

References 12 publications

Pulse propagation in the slow and stopped light regime

Pulse propagation in the slow and stopped light regime

Slow-light-enhanced gain in active photonic crystal waveguides

Optomechanical sensing of liquids outside standard fibers using forward stimulated Brillouin scattering

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