Cocaine detection by a mid-infrared waveguide integrated with a microfluidic chip

Chang, Yu‐Chi; Wägli, Philip; Paeder, Vincent; Homsy, Alexandra; Hvozdara, L.; Wal, P. van der; Francesco, J. di; Rooij, N. F. de; Herzig, Hans Peter

doi:10.1039/c2lc40601b

Cited by 107 publications

(74 citation statements)

References 23 publications

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“…In addition, due to the refractive index contrast between Ge and Si it is possible to form photonic waveguides. Whilst, Ge-on-Si waveguides have been proposed there has only been a few demonstrations [2][3]. In this paper, low loss Ge-on-Si rib waveguides operating at 5.8 μm wavelength are demonstrated.…”

Section: Germanium-on-silicon Waveguides For Mid-infrared Photonic Sementioning

confidence: 99%

Germanium-on-silicon waveguides for mid-infrared photonic sensing chips

Gallacher

Baldassarre

Millar

et al. 2017

2017 IEEE 14th International Conference on Group IV Photonics (GFP)

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Section: Germanium-on-silicon Waveguides For Mid-infrared Photonic Sementioning

confidence: 99%

Germanium-on-silicon waveguides for mid-infrared photonic sensing chips

Gallacher

Baldassarre

Millar

et al. 2017

2017 IEEE 14th International Conference on Group IV Photonics (GFP)

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“…Mis en forme : Indice µm while using a fully monolithic and robust approach [9][10][11]. Furthermore, the implementation of Ge-based optical systems provides good prospects to develop nonlinear mid-IR optical devices, owing to its larger nonlinear refractive index than Si and the suppression of two-photon absorption in Ge for λ > 3.17 µm [12].…”

Section: Mis En Forme : Indicementioning

confidence: 99%

Ge-rich graded-index Si_1-xGex waveguides with broadband tight mode confinement and flat anomalous dispersion for nonlinear mid-infrared photonics

Ramírez¹,

Vakarin²,

Frigerio³

et al. 2017

Opt. Express

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To cite this version:J-M Ramirez, V Vakarin, J Frigerio, P Chaisakul, D Chrastina, et al.. Ge-rich graded-index Si 1-x Ge x waveguides with broadband tight mode confinement and flat anomalous dispersion for nonlinear mid-infrared photonics. Optics Express, Optical Society of America, 2017, 25 (6) Abstract:This work explores the use of Ge-rich graded-index Si 1-x Ge x rib waveguides as building blocks to develop integrated nonlinear optical devices for broadband operation in the mid-IR. The vertical Ge gradient concentration in the waveguide core renders unique properties to the guided optical mode, providing tight mode confinement over a broadband mid-IR wavelength range from λ = 3 µm to 8 µm. Additionally, the gradual vertical confinement pulls the optical mode upwards in the waveguide core, overlapping with the Ge-rich area where the nonlinear refractive index is larger. Moreover, the Ge-rich graded-index Si 1-x Ge x waveguides allow efficient tailoring of the chromatic dispersion curves, achieving flat anomalous dispersion for the quasi-TM optical mode with D ≤ 14 ps/nm/km over a ~ 1.4 octave span while retaining an optimum third-order nonlinear parameter, γ eff . These results confirm the potential of Ge-rich graded-index Si 1-x Ge x waveguides as an attractive platform to develop mid-IR nonlinear approaches requiring broadband dispersion engineering.

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“…41 The waveguide in this case was a germanium (Ge) strip waveguide on a silicon (Si) substrate integrated with a microfluidics to detect cocaine in tetrachloroethylene solutions. In the evanescent field of the waveguide, cocaine exhibited characteristic vibrational absorption at ∼5.8 μm, and the quantum cascade laser (QCL) mid-IR source was matched to that wavelength.…”

Section: Prospects For Hot Embossing For Mid-ir Chipmentioning

confidence: 99%

Mid-infrared integrated optics: versatile hot embossing of mid-infrared glasses for on-chip planar waveguides for molecular sensing

et al. 2014

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Abstract. The versatility of hot embossing for shaping photonic components on-chip for mid-infrared (IR) integrated optics, using a hard mold, is demonstrated. Hot embossing via fiber-on-glass (FOG), thermally evaporated films, and radio frequency (RF)-sputtered films on glass are described. Mixed approaches of combined plasma etching and hot embossing increase the versatility still further for engineering optical circuits on a single platform. Application of these methodologies for fabricating molecular-sensing devices on-chip is discussed with a view to biomedical sensing. Future prospects for using photonic integration for the new field of mid-IR molecular sensing are appraised. Also, common methods of measuring waveguide optical loss are critically compared, regarding their susceptibility to artifacts which tend artificially to depress, or enhance, the waveguide optical loss.

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Cocaine detection by a mid-infrared waveguide integrated with a microfluidic chip

Cited by 107 publications

References 23 publications

Germanium-on-silicon waveguides for mid-infrared photonic sensing chips

Germanium-on-silicon waveguides for mid-infrared photonic sensing chips

Ge-rich graded-index Si_1-xGex waveguides with broadband tight mode confinement and flat anomalous dispersion for nonlinear mid-infrared photonics

Mid-infrared integrated optics: versatile hot embossing of mid-infrared glasses for on-chip planar waveguides for molecular sensing

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