DCG as a Resist Material
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Transcript of DCG as a Resist Material
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DCG AS A RESIST MATERIALD. PADIYAR J. PADIYAR
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CHARACTERISTICS OF A VOLUME HOLOGRAM
AdvantagesHigh EfficiencyBragg SelectivityEase of Development
DisadvantagesData not accessible for mass production
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CHARACTERISTICS OF A SURFACE HOLOGRAM
AdvantagesHigh EfficiencyBragg SelectivityEase of Development
DisadvantagesLow EfficiencySpecialized developing solutions
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PROPOSED NEW SURFACE HOLOGRAM
Characteristics:High efficiencyMass replicableVolume effectsHigher structural rigidity
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E_vol = sin2(pnd/lcosf)wheren = index modulation
d = emulsion thickness
l = recording wavelength
f = reconstruction angle
E_surf = J12((4 p/l)(n-1)(dr)(OR)/I)where
J1 = Bessel function of the first orderl = recording wavelengthn = index of photoresistdr = differential etch rateI = Reconstruction intensityO = Object intensityR = Reference intensity
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DEEP GROOVE EFFICIENCY
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STRATEGY FOR CREATING SURFACE PROFILES IN DCG
Develop a formula for hard DCGMaximize the etch rate while minimizing penetration speed.
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HOW WILL WE KNOW ?
Measurement against theory• Casting• SEM pictures• Electro-plating• Anomalous effects
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CHART OF THEORETICAL VOLUME GRATING
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COMPARISON STANDARD DCG VS RESIST
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DCG SURFACE GRATINGS
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DCG VS CASTING
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RESIST VS CASTING OF DCG
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SEM PHOTO OF SURFACE DCG
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ANOMOLOUS EFFECTS
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ADVANTAGES OF SURFACE DCG Sensitivity at lower wavelengths Higher resolution Mass-producible volume holograms Development in just water More Environmentally friendly than
resist Cheaper to produce and ship