N. Ismail

Raman spectroscopy with an integrated arrayed-waveguide grating

An integrated arrayed-waveguide grating fabricated in silicon-oxynitride technology is applied to Raman spectroscopy. After its validation by reproducing the well-known spectrum of cyclohexane, polarized Raman spectra are measured of extracted human teeth containing localized initial carious lesions. Excellent agreement is obtained between the spectra of healthy and carious tooth enamel measured with our integrated device and spectra recorded using a conventional Raman spectrometer. Our results represent a step toward the realization of compact, hand-held, integrated spectrometers, e.g. for the detection of dental caries at an early stage.

Design of low-loss arrayed waveguide gratings for applications in integrated Raman spectroscopy

An integrated low-loss arrayed waveguide grating is designed for Raman spectroscopy of the human skin. The device layout targets spectral analysis of Raman-scattered light for in vivo determination of water concentration in the stratum corneum.

Integrated arrayed waveguide grating spectrometer for on-chip optical coherence tomography

A silicon oxynitride based arrayed waveguide grating spectrometer was designed for on-chip spectral-domain optical coherence tomography systems. Transmission measurement results are promising for miniaturizing the current optical coherence tomography systems through integrated optics.

Broadband polarization-insensitive arrayed waveguide gratings for Raman spectroscopy

We present two arrayed waveguide gratings fabricated in silicon-oxynitride for near infrared Raman spectroscopy. Our devices exhibit very low losses and polarization insensitivity over a large spectral range of 156 nm and 214 nm, respectively.

On-chip Raman spectrometer for the detection of early dental caries

We measured Raman spectra of extracted human teeth using an integrated arrayed-waveguide-grating spectrometer fabricated in silicon-oxynitride technology. The results represent a step towards the realization of compact, hand-held, integrated spectrometers for the detection of early dental caries.