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| 3. |
- Kazmierczak, Andrzej, et al.
(author)
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High quality optical microring resonators in Si3N 4/SiO2
- 2008
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In: Proceedings of the 14th European Conference on Integrated Optics - ECIO'08 Eindhoven. - 9789038613178 ; , s. 313-316
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Conference paper (peer-reviewed)abstract
- We have experimentally demonstrated high Q-factors strip waveguide resonators using the Si3N4/SiO2 material platform at the wavelength of 1.31μm. The analyzed filters demonstrate high quality factors reaching 133,000. The dependence on resonator radii and coupling gap is also discussed.
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| 4. |
- Kazmierczak, Andrzej, et al.
(author)
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Light coupling and distribution for Si3N4/SiO2 integrated multichannel single-mode sensing system
- 2009
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In: Optical Engineering. - : SPIE-Intl Soc Optical Eng. - 0091-3286 .- 1560-2303. ; 48:1
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Journal article (peer-reviewed)abstract
- We present an efficient and highly alignment-tolerant light coupling and distribution system for a multichannel Si3N4/SiO2 single-mode photonics sensing chip. The design of the input and output couplers and the distribution splitters is discussed. Examples of multichannel data obtained with the system are given.
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| 5. |
- Maire, Guillaume, et al.
(author)
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High efficiency silicon nitride surface grating couplers
- 2008
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In: Optics Express. - 1094-4087. ; 16:1, s. 328-333
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Journal article (peer-reviewed)abstract
- High efficiency surface grating couplers for silicon nitride waveguides have been designed, fabricated, and characterized. Coupling efficiencies exceeding 60 % are reported at a wavelength of 1.31 mu m, as well as angular and wavelength -3 dB tolerances of 4 and 50 nm, respectively. When the wavelength is increased from 1310 nm to 1450 nm the coupling efficiency progressively decreases but remains above 20 % at 1450 nm. The influence of the duty ratio of the grating has also been investigated: maximum coupling efficiency was obtained at 50 % duty ratio.
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| 7. |
- Tinetti, Giovanna, et al.
(author)
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The science of EChO
- 2010
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In: Proceedings of the International Astronomical Union. - 1743-9213 .- 1743-9221. ; 6:S276, s. 359-370
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Journal article (peer-reviewed)abstract
- The science of extra-solar planets is one of the most rapidly changing areas of astrophysics and since 1995 the number of planets known has increased by almost two orders of magnitude. A combination of ground-based surveys and dedicated space missions has resulted in 560-plus planets being detected, and over 1200 that await confirmation. NASA's Kepler mission has opened up the possibility of discovering Earth-like planets in the habitable zone around some of the 100,000 stars it is surveying during its 3 to 4-year lifetime. The new ESA's Gaia mission is expected to discover thousands of new planets around stars within 200 parsecs of the Sun. The key challenge now is moving on from discovery, important though that remains, to characterisation: what are these planets actually like, and why are they as they are In the past ten years, we have learned how to obtain the first spectra of exoplanets using transit transmission and emission spectroscopy. With the high stability of Spitzer, Hubble, and large ground-based telescopes the spectra of bright close-in massive planets can be obtained and species like water vapour, methane, carbon monoxide and dioxide have been detected. With transit science came the first tangible remote sensing of these planetary bodies and so one can start to extrapolate from what has been learnt from Solar System probes to what one might plan to learn about their faraway siblings. As we learn more about the atmospheres, surfaces and near-surfaces of these remote bodies, we will begin to build up a clearer picture of their construction, history and suitability for life. The Exoplanet Characterisation Observatory, EChO, will be the first dedicated mission to investigate the physics and chemistry of Exoplanetary Atmospheres. By characterising spectroscopically more bodies in different environments we will take detailed planetology out of the Solar System and into the Galaxy as a whole. EChO has now been selected by the European Space Agency to be assessed as one of four M3 mission candidates. © International Astronomical Union 2011.
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| 8. |
- Vivien, Laurent, et al.
(author)
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A high efficiency silicon nitride grating coupler
- 2007
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In: 2007 4th IEEE International Conference on Group IV Photonics. - : IEEE. - 9781424409341 ; , s. 157-159
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Conference paper (peer-reviewed)abstract
- The experimental demonstration of a high efficiency silicon nitride grating coupler is reported for wavelengths from lambda=1.25 to 1.45 mu m for TE polarization. At the resonant angle, a coupling efficiency higher than 60% has been measured.
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| 10. |
- Wang, Yuchen, et al.
(author)
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Enhancing Si3N4 Waveguide Nonlinearity with Heterogeneous Integration of Few-Layer WS2
- 2021
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In: ACS Photonics. - : American Chemical Society (ACS). - 2330-4022. ; 8:9, s. 2713-2721
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Journal article (peer-reviewed)abstract
- The heterogeneous integration of low-dimensional materials with photonic waveguides has spurred wide research interest. Here, we report on the experimental investigation and the numerical modeling of enhanced nonlinear pulse broadening in silicon nitride waveguides with the heterogeneous integration of few-layer WS2. After transferring a few-layer WS2 flake of similar to 14.8 mu m length, the pulse spectral broadening in a dispersion-engineered silicon nitride waveguide has been enhanced by similar to 48.8% in bandwidth. Through numerical modeling, an effective nonlinear coefficient higher than 600 m(-1) W-1 has been retrieved for the heterogeneous waveguide indicating an enhancement factor of larger than 300 with respect to the pristine waveguide at a wavelength of 800 nm. With further advances in two-dimensional material fabrication and integration techniques, on-chip heterostructures will offer another degree of freedom for waveguide engineering, enabling high-performance nonlinear optical devices, such as frequency combs and quantum light sources.
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