Germanium windows - featured customer Yeheng Wu
BOARD 98 THE DEVELOPMENT OF ONE-DIMENSIONAL, MULTILAYERED PVK/PVA
PHOTONIC CRYSTALS. Dora C. Huang, Yeheng Wu,
28118 Edgepark BIvd, Westlake OH 44145 (Hathaway Brown School).
Photonic crystals are known for their unusual properties regarding the
propagation of light and their bandgaps. A photonic bandgap, which contains many
of the same features of an electronic bandgap in a semiconductor, is a forbidden
region for photons (light). These bandgaps can be created with materials that
have a large difference in their refractive indices and can be viewed on a
transmission graph as a dip, with the dip representing low light transmittance.
The purpose of this project was to create a one-dimensional, multilayered,
polymer photonic crystal, where its bandgap could be viewed through a graph of
its transmission, taken from a spectrophotometer. It was hypothesized that the
experiment would produce such a crystal and that a dip in the transmission of
light would occur at visible to near infrared range on the graph, indicating a
bandgap with an expected width of 140 nm. The crystal (n=4) was created by spin
coating alternating layers of poly vinylcarbazole (PVK) and poly vinylalcohol (PVA).
The transmittance curve of the thirteen layer sample showed a 39 percent dip in
the transmission at 900 nm (near the center of the bandgap that stretched from
approximately 825 nm-990 nm), which provided evidence that the sample created
was the periodic structure desired. These one-dimensional photonic crystals can
be used to create very small lasers, when the crystal is doped with laser dye,
or added to a substance to create extremely white pigment.
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| Germanium optics - Ge |
| Model | Product Name+ | Buy Now |
| E-Ge-12.7-25.4 | Germanium etalon, ø 12.7 mm x 25.4 mm (ø 0.5" x 1") |
|
| W-Ge-25.4-3 | Germanium window, ø 25.4 mm x 3 mm |
|
| W-Ge-38.1-4 | Germanium window, ø 38.1 mm x 4 mm |
|
| W-Ge-38.1-4 | Germanium window, ø 38.1 mm x 4 mm, coated |
|
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