Numerical analysis of a miniaturized design of a Fabry–Perot resonator based on silicon strip and slot waveguides for bio-sensing applications

ABSTRACT

A miniaturized design of a Fabry–Perot resonator based on silicon strip and slot waveguide is presented. The corrugated Bragg gratings and a cavity are structured on both sides of a waveguide. The spectral characteristics of both the resonator designs are studied. The variation of the medium refractive index is detected by monitoring the shift of the spectral maxima of the Fabry–Perot cavity. The transmission spectrum and electric field distribution of the sensor structures are simulated using finite-element method. The resonator based on slot-waveguide shows better sensitivity and figure of merits as compared to strip waveguide. Our proposed sensor design has the potential to find further applications in biomedical science and nano-photonic circuits.

KEYWORDS:

• Miniaturized design
• Fabry–Perot resonator
• finite-element method
• slot waveguide
• strip waveguide
• sensor

ORCID

M. A. Butt http://orcid.org/0000-0003-0829-4886

S. N. Khonina http://orcid.org/0000-0001-6765-4373

N. L. Kazanskiy http://orcid.org/0000-0002-0180-7522

Additional information

Funding

This work was financially supported by the Russian Foundation for Basic Research [grant number 16-29-09528_ofi_m] for numerical calculations, by the Ministry of Science and Higher Education within the State assignment FSRC ‘Crystallography and Photonics’ RAS [grant number 007-GZ/Ch3363/26] for theoretical results, and ‘A next-generation worldwide quantum sensor network with optical atomic clocks’ project is carried out within the TEAM IV Programme of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund.