Monolithic Distributed Bragg Reflector Cavities in Al2O3 with Quality Factors Exceeding 106

Bernhardi, E.H. and Lu, Q. and Wolferen van, H.A.G.M. and Wörhoff, K. and Ridder de, R.M. and Pollnau, M. (2011) Monolithic Distributed Bragg Reflector Cavities in Al2O3 with Quality Factors Exceeding 106. Photonics and Nanostructures . ISSN 1569-4410

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Abstract:	>The design, fabrication, and characterization of surface relief Bragg gratings integrated with aluminum oxide ridge waveguides are reported. After patterning a photoresist layer by laser interference lithography, uniform gratings with a depth of 120 nm and a period of 507 nm were etched into the SiO $_2$ top cladding. The grating length varied between 1.25 mm and 4.75 mm. The grating-induced loss was 0.08 ± 0.01 dB/cm, while the maximum grating reflectivity exceeded 99%. These values enabled the realization of monolithic distributed Bragg reflector cavities with finesse up to 147 and quality factors of more than 1E6. The measured performance agrees very well with predictions based on coupled mode theory.
Item Type:	Article
Copyright:	© 2011 Elsevier
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Integrated Optical MicroSystems (IOMS)
Link to this item:	http://purl.utwente.nl/publications/76404
Official URL:	http://dx.doi.org/10.1016/j.photonics.2011.03.001
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