Flat-focal-field integrated spectrometer using a field-flattening lens
| Autor: | R.M. de Ridder, Kerstin Worhoff, B.I. Akça, Gabriel Sengo, Markus Pollnau, Alfred Driessen |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Silicon oxynitride Field (physics) Physics::Optics Astrophysics::Cosmology and Extragalactic Astrophysics Grating Flattening law.invention chemistry.chemical_compound Optics law Detector array Star coupler Physics Spectrometer business.industry Detector IOMS-PIT: PHOTONICS INTEGRATION TECHNOLOGY Image plane Atomic and Molecular Physics and Optics Lens (optics) Silicon nitride chemistry Optoelectronics business Refractive index |
| Zdroj: | Optics letters, 37(20), 4281-4283. The Optical Society Scopus-Elsevier Conference on Lasers and Electro-Optics, CLEO/Europe 2013 |
| ISSN: | 0146-9592 |
| Popis: | We present a new flat-focal-field arrayed-waveguide grating (AWG) design that utilizes an integrated field-flattening lens placed in the second star coupler. The effective index difference between slab and lens region is obtained by introducing a thin silicon nitride (SiN) layer to a silicon oxynitride environment. Depending upon the SiN layer position, two different lens designs are implemented. As a proof of concept two 81-channel AWGs, one with and one without the lens, are designed, fabricated, and characterized for each lens design. The measurements show that the adjacent crosstalk at the peripheral channels is improved by 2 dB, an improvement which is predicted to become more pronounced for AWGs with higher number of output waveguides (e.g., ∼16 dB for 200 output waveguides). Only 0.4 dB of extra excess loss is introduced by the lens. |
| Databáze: | OpenAIRE |
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