Photonic Crystal Sensors Silicone Method. What are photonic crystals? Repeating nanostructures that allow only certain wavelengths to go through the crystal.

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Presentation transcript:

Photonic Crystal Sensors Silicone Method

What are photonic crystals? Repeating nanostructures that allow only certain wavelengths to go through the crystal Photons photonics as electrons electronics Band gaps in photonics and electronics Google.com www-unix.oit.umass.edu/~dinsmore/softcmp.html

Optical Properties of Photonic Crystals Transmission and reflection spectrum Use of spectrometer

Applications What can be sensed with photonic crystals? Environmental Changes Temperature Ph Silicone Ultrasound

Bragg’s equation: the wavelength of the center of the stop band can be calculated since the band is a diffraction based phenomenon How do Photonic crystals work?

Bragg’s equation in action Changing angle at which the crystal is seen changes the color

Self Assembly Silicone Method:  Materials -Polystyrene Beads (aqueous dispersions 0.2um and 0.35um 2.6%) -Substrate: glass slides -Plasma cleaner -Silicone fluids: DMS-T11 DMS-T00 -Hot plate -PDMS+DMS(T11) +curing agent (ratio of 5:5:1)

Materials

Silicone Method Procedure: 1. Put glass slides (substrate) in plasma cleaner for about 5 minutes 2. Place aqueous dispersions of PB beads on substrate 3. Cover this liquid film with silicone liquid 4. Place sample on hot plate and let water evaporate for certain amount of time, depending on vitality of silicone. 5. Remove liquid silicone with Kim-Wipe 6. Combine PDMS, DMS, and curing agent in a 5:5:1 ratio 7. Let PDMS elsatometer to be cured and hardened.

Silicone Method How does it work? - Water slowly evaporates by diffusing through the skin of silicone -Embedding crystal in an elastomer matrix made of PDMS. -PDMS fills the voids, expanding or contracting depending on the environmental change.

Characterizing the crystal through spectrometry Graphs obtained: transmittance and reflectance

Problems encountered in experiments Evaporation rings created by contact line. Polystyrene spheres do not form an uniform structure. (cracks) ‘White crystals’

Detecting ultrasound Transducer sends pulse that will contract or expand the PDMS in the crystal, which will change the wavelength. As this happens the reflection intensity decreases in compression and increases in expansion  creates an attenuating signal of the laser reading as a function of time.