All-silicon optical temperature sensor based on Multi-Mode Interference

2013

In the paper examinations of a lightguide sensor on the base of gradient index multimode interference structures are presented. Investigated structures were fabricated in potassium-sodium ion exchange process. Multimode interference sensor was designed for ammonia detection. Bromocresol purple covering the multimode section was used as a sensing layer. Numerical calculations were performed with the use of modal analysis and beam propagation method to optimise sensor geometry and sensing layer thickness. Experimental results show the possibility of ammonia detection from the concentration of tens ppm.

Section: Introductionmentioning

confidence: 93%

MMI Structures Covered by Bromocresol Purple for Ammonia Detection

2013

“…The Mach-Zehnder interferometer is a device used to determine the relative phase shift between two collimated beams from a coherent light source [9].…”

Section: Mach-zehnder Interferometermentioning

confidence: 99%

“…The analysis of the particular models was based on the numerical BPM method [9,10]. The analysis was focused on concepts where the energy of the excited modes was located principally in the core, and the interaction with the sensor layer was affected mainly through the * corresponding author; e-mail: artur.szewczuk@polsl.pl evanescent field of the modes.…”

Section: Introductionmentioning

confidence: 99%

Multimode Interference Structures of Variable Geometry for Optical Sensor Application

2010

The paper presents the analysis results of a waveguide sensor based on multimode interference structures. The multimode section was covered with sensor material. The change of optical parameters of the cover entails the change of propagation conditions of light in the structure. By measuring the light intensity at the output of the structure, we can define external physicochemical parameters to which the sensor layer is sensitive. The paper presents the method to adjust the sensitivity of the device through a proper selection of the thickness of the particular layers of multimode waveguides. We present, among others, the analysis results of optical systems whose parameters of the sensor layer corresponded with the parameters of wolfram oxide (WO 3 ), being the material frequently applied as a gas-sensitive layer in gas sensors. We have proposed a configuration of a sensor based on the Mach-Zehnder interferometer whereof one arm is a multimode section and the other one a single mode waveguide. The detection method was narrowed down here to the measurement of phase difference between the waves propagating in the respective arms.

“…Applications of multimode interference (MMI)structures in waveguide sensor technology have been a subject to research studies of recent years [1][2][3][4][5]. The paper [1] proposes an optical temperature sensor based on MMI structures in silicon.…”

Section: Introductionmentioning

confidence: 99%

“…The paper [1] proposes an optical temperature sensor based on MMI structures in silicon. Temperature changes cause changes in the refractive index of the interference section.…”

Section: Introductionmentioning

confidence: 99%

Applications of Gradient Index Multimode Interference Structures in the Technology of Optical Sensor

2011

The aim of the work is the presentation of operating principle and properties of multimode interference structure devices made in gradient index technology by K + and Na + ion exchange method from the point of view of optical sensor design. Numerical analysis was performed using beam propagation method. Analyzed sensor structures are covered by nanolayers whose refractive index higher than the multimode interference section index is the reason for the concentration of wave propagation energy in the sensor layer area and its vicinity. Modifications of external propagation conditions change the refractive index and extinction coefficient of a sensor layer. The variation of optical properties leads to the modification of waveguiding conditions in the multimode interference coupler.