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Photonic devices laboratory Sensor-related projects

Photonic devices laboratory Sensor-related projects. Environment and Biological Porous Silicon Optical Sensors Sensor based on Periodically Segmented Waveguides Sensors based on active lasing optical waveguides Critical sensitivity effect: SOI sensor Critical sensitivity effect : PSi sensor.

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Photonic devices laboratory Sensor-related projects

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  1. Photonic devices laboratorySensor-related projects • Environment and Biological Porous Silicon Optical SensorsSensor based on Periodically Segmented WaveguidesSensors based on active lasing optical waveguidesCritical sensitivity effect: SOI sensorCritical sensitivity effect : PSi sensor Shlomo Ruschin Collaborators:Prof. Jehudit RishponProf. Menachem NathanDr. Asher PeledTanya HutterKeren Hakshur

  2. Tel-Aviv University Porous Silicon Optical Sensors Tanya Hutter and Shlomo Ruschin

  3. Ammonia storage warehouse ALARM ! NH3 NH3 NH3 NH3 NH3 NH3 Motivation (1) porous silicon sensors Light source and receiving fiber PSi Sensors ADVANTAGES: • Cheap • Small • Remote • Passive (can be used in flammable environment)

  4. Motivation (2) porous silicon sensors • Breath analysis for clinical applications Ammonia is listed as one of the marker molecules that can identify kidney impairment.

  5. 500 nm Porous silicon • Porous silicon (PSi) is a material formed by electrochemical etching of crystalline silicon. • ‘nano-sponge’

  6. Porous silicon (PSi) - Why !?!? • Increased surface interaction area 200-1000 m2/cm3. • Simplicity and repeatability of fabrication. • Ability to produce pores in the range of 30Å to 1μm and porosities of 10-90%. • Compatibility with technology: easily integrable with Si-based microelectronics. • Biocompatible H. Ouyang et al., Frontiers in Surface Nanophotonics, 2007

  7. Outlet Gas chamber White light source Porous Silicon Spectrometer Humidifier Flowmeters NH3 Gas N2 Gas Optical Measurement Setup • Light from tungsten-halogen lamp passes through collimating lens. • The reflected rays are collected and transmitted to a PC via spectrometer. • The reflected spectra is collected at wavelengths 400-1000nm. Experimental optical setup

  8. Ammonia vapor & pH indicator • After Exposure: ammonia reacts with BTB, and the sample changes its color from yellow to blue. The reflected spectrum Yellow absorbance at 400-430nm Blue absorbance at 550-650nm

  9. Multi-Sensing Principle Gas out Porous silicon surface Gas in

  10. Multi-Sensing Principle • Sensor array concept. • Each section is made of porous silicon with a different functionality. • White light is collimated to illuminate the entire sample. • The reflected light from all the sections is measured simultaneously in a non-imaging configuration using a single detector. • The obtained spectrum consists of many overlapping interference spectra each reflected from a different sensor section.

  11. Model system: Biotin-Avidin PSi sample before and after biotin connection to the PSi sensor. PSi sample before and after Avidin connection to the PSi sensor.

  12. Periodically Segmented Waveguides and sensors based upon them

  13. The basic PSW-MZI sensor Processing is simpler (single photolithography step)

  14. Examples of sensing systems experimentally tested: • DNA Hybridization • Toxics- Parathion hydrolase • Antigen binding (Biotin-Avidin)

  15. DNA Hybridization

  16. Sensors based on active lasing optical waveguides

  17. Concept Sensor l Pump Architecture & detection scheme Suitable for both remote sensing & biomedical device

  18. Monolithic rare-earth doped sol-gel tapered rib waveguide laser Nd-doped tapered rib waveguide laser- schematic view, not drawn to scale for clarity

  19. Output lasing power as a function of input pump power for different pump wavelengths Emission spectra of the laser device for different input pump powers.

  20. Optical gain measurement setup

  21. Critical sensitivity effect in an interferometer sensor Ronen Levy, Shlomo Ruschin*, and Damian Goldring 2mm

  22. The Critical Sensitivity Effect

  23. Critical sensitivity effect in an interferometer sensor Ronen Levy, Shlomo Ruschin*, and Damian Goldring Splitting effect Sensor output power for the scanned wavelength range without illumination (Blue, solid line) and with illumination (Green, dashed line).

  24. Dynamic Range Enhancement and Phase-Ambiguity Elimination in Wavelength-Interrogated Interferometric Sensor Tanya Hutter,1 Stephen R. Elliott,1 and Shlomo Ruschin2,*

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