In this paper, the electromagnetic scattering properties due to periodical configurations consisting of planar optical waveguides completely surrounded by a fluid media, in gaseous or liquid phase, are analyzed. In this new design, fluid separates the consecutive optical waveguides and it is also the common cover for all of them, thus significantly increasing the effect of the fluid on the evanescent field. This new configuration is designated as fluidic segmented optical waveguides. The theoretical algorithm was developed and recently updated by the authors, and it is based on the generalized scattering matrix concept, together with the generalized telegraphist equations formulism and modal matching technique. We present the first theoretical results concerning to these periodical structures with a fluidic common cover. To carry out the simulations, with the purpose to manufacture these devices in the future, glass and polymer were chosen as materials for the optical waveguides substrate and for enclosing the fluid as common cover medium, respectively. The spectral results obtained for the module and phase of the reflection and transmission coefficients have shown great sensitivity of the new proposal to the variations of the refractive index of the fluid, making it very attractive for the design of refractive index sensors and optical biosensors.
6. Nunes, P. S., et al., "Refractive index sensor based on a 1D photonic crystal in a microfluidic channel," Sensors, Vol. 10, 2348-2358, 2010.
7. Konopsky, V. N., et al., "Photonic crystal biosensor based on optical surface waves," Sensors, Vol. 13, 2566-2578, 2013.
8. Ramanujam, N. R., et al., "Enhanced sensitivity of cancer cell using one dimensional nano composite material coated photonic crystal," Microsystem Technologies, 1-8, 2018.
9. Taya, S. A., et al., "Photonic crystal with epsilon negative and double negative materials as an optical sensor," Optical and Quantum Electronics, Vol. 50, No. 5, 222-1-222-11, 2018.
10. Fainman, Y., D. Psaltis, L. P. Lee, and Ch. Yang, Optofluidics: Fundamentals, Devices, and Applications, McGraw-Hill Companies, Inc., 2010.
11. Monat, C., et al., "Integrated optofluids: A new river of light," Nature Photonics, Vol. 1, 106-113, 2007.
12. Erickson, D., et al., "Nanofluidic tuning of photonic crystals circuits," Proc. of SPIE, Vol. 6475, 647513(1-11), 2007.
13. Luchansky, M. S. and R. C. Bailey, "High-Q optical sensors for chemical and biological analysis," Anal. Chem., Vol. 84, 793-821, 2012.
14. Rodriguez, J., et al., "Electromagnetic waves scattering at interfaces between dielectric waveguides: A review on analysis and applications," Progress In Electromagnetics Research B, Vol. 37, 103-124, 2012.
15. Rodriguez, J. and A. F. Gavela, "Spectral behaviour of planar optical waveguides and microchannels in cascade: Theoretical evaluation," Progress In Electromagnetics Research M, Vol. 72, 1-11, 2018.
16. Alvarez, M. C., et al., "Critical points in the fabrication of microfluidic devices on glass substrates," Sensors and Actuators B, Vol. 130, 436-448, 2008.
17. Synowicki, R. A., et al., "Optical properties of soda-lime float glass from spectroscopic ellipsometry," Thin Solid Films, Vol. 519, 2907-2913, 2011.