Novel loss measurement technique for optical waveguides by imaging of scattered light

Foley, Bob; Melman, P.; Vo, Kien Thach Trung

doi:10.1049/el:19920368

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…α =0.345 cm -1 measured by imaging of scattered light [12], L=1 cm, A eff =(3.5±0.18) µ m 2 estimated from the recorded modal intensity profile [10], λ =800 nm and t p =160 fs. In this way, the intensity-dependent refractive index n 2 was found to be (7.23±0.36)×10 -19 m 2 /W, which is higher than silica glass (n 2 ∼2.2×10 -20 m 2 /W ) by more than one order of magnitude.…”

Section: Spm Induced Spectramentioning

confidence: 99%

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Tai¹,

Wilkinson²,

Perney³

et al. 2004

Opt. Express

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Self-phase modulation has been observed for ultrashort pulses of wavelength 800nm propagating through a 1 cm-long Ta2O5 rib waveguide. The associated nonlinear refractive index n2 was estimated to be 7.23x10-19 m2/W, which is higher than silica glass by more than one order of magnitude. Femtosecond time of flight measurements based on a Kerr shutter configuration show that the group velocity dispersion is small at a wavelength of 800 nm, confirming that dispersion may be neglected in the estimation of n2 so that a simplified theory can be used with good accuracy.

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Section: Spm Induced Spectramentioning

confidence: 99%

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Tai¹,

Wilkinson²,

Perney³

et al. 2004

Opt. Express

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show abstract

“…The evaluations of RBS and ERDA spectra were done by GISA3 [19] and SIMNRA code, respectively [20]. Optical losses were measured by using scattering detection method [21]. For optical coupling we used the Bi 12 GeO 20 prism (n= 2.54350, λ= 632.8 nm); CCD camera with 1028 x 1288 pixels by 256 graylevels for detecting the scattered optical radiation was applied.…”

Section: Methodsmentioning

confidence: 99%

Optical properties of Er³⁺+ Yb³⁺doped gallium nitride layers

Prajzler

Alves²,

Buchal

et al. 2006

SPIE Proceedings

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We report about properties of Gallium Nitride layers doped by Erbium and Erbium/Ytterbium ions. The GaN layers were fabricated by Metal Organic Chemical Vapor Deposition on sapphire substrate, and Er 3+ and Yb 3+ ions were incorporated into the deposited layers by using ion implantation. After the implantation the samples were annealed in nitrogen atmosphere. The structures of the GaN samples were examined by the X-Ray Diffraction analysis; composition of the samples was measured by Rutherford Backscattering Spectroscopy and Elastic Recoil Detection Analysis. The GaN layers had single crystalline hexagonal wurtzite structure and content of Er 3+ and Er 3+ \Yb 3+ ranged from 0.05 to 3.38 at. %. The photoluminescence measurement was carried out at excitation of λ ex = 632.8 nm (temperature 4 K) and λ ex = 980 nm (room temperature). Photoluminescence spectra taken at 4 K showed typical erbium 4 I 13/2 → 4 I 15/2 emission bands. Some of our samples exhibited the desired emission even at the room temperature, which indicated that the samples were of a good quality what concerned their crystallographic homogeneity, as well as distribution and appropriate concentration of the Er 3+ and Yb 3+ .

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A Cantilever Sensor With an Integrated Optical Readout for Detection of Enzymatically Produced Homocysteine

Koev

Fernandes

Bentley

et al. 2009

IEEE Trans. Biomed. Circuits Syst.

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Microcantilever sensors have been recognized as a promising sensor platform for various chemical and biological applications. One of their major limitations is that the measurement of cantilever displacement typically involves elaborate off-chip setups with free-space optics. An improved device, known as the optical cantilever, has been proposed recently to eliminate the external optics. The response of the optical cantilever is measured on-chip through integrated waveguides. However, this method has been previously demonstrated only for devices operating in air, whereas most chemical and biological samples are in solution state. We present the first optical cantilever capable of operation in liquid. We test it with the detection of homocysteine with a minimal concentration of 10 muM. The minimal measurable cantilever displacement and surface stress are 5 nm and 1 mN/m, respectively. The presented device will be used in studies of a homocysteine-producing bacterial pathway for the purpose of drug discovery. It can also be extended to various other chemical- or biological-sensing applications by selecting an appropriate surface coating.

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Novel loss measurement technique for optical waveguides by imaging of scattered light

Cited by 5 publications

References 4 publications

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Optical properties of Er³⁺+ Yb³⁺doped gallium nitride layers

A Cantilever Sensor With an Integrated Optical Readout for Detection of Enzymatically Produced Homocysteine

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Novel loss measurement technique for optical waveguides by imaging of scattered light

Cited by 5 publications

References 4 publications

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation

Optical properties of Er3++ Yb3+doped gallium nitride layers

A Cantilever Sensor With an Integrated Optical Readout for Detection of Enzymatically Produced Homocysteine

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Optical properties of Er³⁺+ Yb³⁺doped gallium nitride layers