Impact of high index buffer layer on the improvement of the MMI sensor sensitivity

Artur Szewczuk, Marek Błahut

Abstract


The results of investigations of the impact of high index buffer layer on the improvement of the multimode interference (MMI) sensor sensitivity are presented. The basis of the presented research is a gradient index MMI structure with multimode section length relating to the length of the input field image formation. Multimode section is covered with material which changes its optical parameters (refractive index and extinction coefficient) when is exposed to appropriate gaseous environments. The coating parameters changes effect on light propagation condition in structure which can be seen as the output signal variation. In this configuration a thin buffer layer of high refractive index is placed between the sensing layer and a gradient core. We present results showing how these buffer layers lead to an increase of sensitivity of the sensor based on the MMI structures. Performed analysis are based on the numerical BPM calculation.

Full Text: PDF

References
  1. V. Passaro et al, "Recent Advances in Integrated Photonic Sensors", Sensors. 12, 15558 (2012). CrossRef
  2. P. V. Lambeck, "Integrated optical sensors for the chemical domain", Measur. Sci. Technol. 17, R93 (2006). CrossRef
  3. Hua, Ping, et al, "Integrated optical dual Mach–Zehnder interferometer sensor", Sens. Actuat. B-Chem. 87, 250 (2002). CrossRef
  4. E. Maciak, et al, "Effect of humidity on NH3 gas sensitivity of NAFIONÒ/WO3 sensing structure of SPR sensor", Molecular and Quantum Acoustics 26, 205 (2005). DirectLink
  5. G. Stewart, B. Culshaw, "Optical waveguide modelling and design for evanescent field chemical sensors", Opt. Quant. Electron. 26, 249 (1994). CrossRef
  6. A. Szewczuk, M. Blahut, "Multimode Interference Structures of Variable Geometry for Optical Sensor Application", Acta. Phys. Pol. A 118, 1254 (2010). DirectLink
  7. A. Szewczuk, M. Błahut and W. Pyka, "Model of Optical Sensor on the Base of MMI Structures", Acta. Phys. Pol. A 118, 1250 (2010). DirectLink
  8. A. Szewczuk, M. Blahut, "Polarization effects in K+–Na+ ion exchanged MMI structures with absorption cover", Opt. Appl. 43, 441 (2013). DirectLink
  9. A. Szewczuk, M. Blahut, "MMI Structures Covered by Bromocresol Purple for Ammonia Detection", Acta. Phys. Pol. A 124, 570 (2013). CrossRef
  10. K. R. Kribich, et al. "Novel chemical sensor/biosensor platform based on optical multimode interference (MMI) couplers", Sens. Actuat. B-Chem. 107, 188 (2005). CrossRef
  11. M. Błahut . Wymiana jonowa w szkle i jej zastosowania w technologii wybranych elementów biernych optyki zintegrowanej (Zeszyty Naukowe. Matematyka-Fizyka/Politechnika Śląska, 2002) DirectLink

Full Text:

PDF

We use cookies that are necessary for the website to function and cannot be switched off in our systems. Click here for more information.


Photonics Letters of Poland - A Publication of the Photonics Society of Poland
Published in cooperation with SPIE

ISSN: 2080-2242