optoelectronic world

 

JDSU

FIGURE 1. A combination of thin films with holograms, and in some cases ^{an additional advantage} with metal/dielectric coatings, pro- ^{for security, even though} duced these chromagrams, which al- it can make the process low inclusion of holographic or dif- a bit pricey for coloring fractive effects, color-shifting imagery, commodity items.

patterned-metal, and covert features, The thin-film pigment ^{all in the same 2-D space.} is based on identical back-to-back Fabry-Perot cavi- Difficult to ties applied to a surface in a single counterfeit layer of 1-µm-thick flakes. A transpar-Because color-shift- ent glass layer sandwiched between ing effects are obvious an opaque reflective metal and a to the unaided eye they semitransparent absorber material are desirable for deco- forms each Fabry-Perot cavity. As the rative and security ap- angle of viewing increases away from plications. The benefit the normal, the optical-path length in security applications through the Fabry-Perot cavity chang-is twofold: the obvious es, causing the viewer to perceive a color shift helps to de- change in color. tect and deter counter- When the pigment is applied to a feiting. That the color- surface, there is no way to know be-shifting effects can forehand whether individual flakes

ence-based coloration methods allow only be reproduced through a highly will land right side up or upside down. designers to work with a palette that is sophisticated combination of techni- So the 1-µm flake thickness actually literally dynamic and sparkling. cal and manufacturing wizardry offers consists of back-to-back Fabry-Perot

 

Back-thinned. Cooled. Sensitive.

Introducing the QE65000 -- yet another great spectrometer from Ocean Optics

Cicely B., Applications Scientist

Perfect for Raman spectroscopy, fluorescence, astronomy,

DNA sequencing, thin film reflectivity and more

Achieves up to 90% quantum efficiency

TE-cooled, back-thinned detector provides exceptional native response in the UV; covers 200-1100 nm range

Real People, Real Answers

Pulse generator for external device triggering

15-minute integration time for low-level fluorescence detection

Detector’s columns are binned prior to readout to minimize readout noise and increase S:N

10 user-programmable digital I/O lines let you interface the

Call Ocean Optics and talk over your optical sensing needs with one of our knowledgeable Applications Scientists. We’ll answer your call in person -- you never get a machine!

QE65000 to other devices

727.733.2447

Starting at $9,999

US: 727.733.2447 OceanOptics.com

Europe: +31 (0) 26 319 0500 Info@OceanOptics.com

Raman spectra shift comparison of xylenes. Acquired
using a QE65000, a 100 m W laser, and a probe
for Raman spectroscopy.

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