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D. PADIYAR J. PADIYAR. DCG as a Resist Material. Advantages High Efficiency Bragg Selectivity Ease of Development Disadvantages Data not accessible for mass production. Characteristics of a Volume Hologram. Advantages High Efficiency Bragg Selectivity Ease of Development - PowerPoint PPT Presentation
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DCG AS A RESIST MATERIALD. PADIYAR J. PADIYAR
CHARACTERISTICS OF A VOLUME HOLOGRAM
AdvantagesHigh EfficiencyBragg SelectivityEase of Development
DisadvantagesData not accessible for mass production
CHARACTERISTICS OF A SURFACE HOLOGRAM
AdvantagesHigh EfficiencyBragg SelectivityEase of Development
DisadvantagesLow EfficiencySpecialized developing solutions
PROPOSED NEW SURFACE HOLOGRAM
Characteristics:High efficiencyMass replicableVolume effectsHigher structural rigidity
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
DEEP GROOVE EFFICIENCY
STRATEGY FOR CREATING SURFACE PROFILES IN DCG
Develop a formula for hard DCGMaximize the etch rate while minimizing penetration speed.
HOW WILL WE KNOW ?
Measurement against theory• Casting• SEM pictures• Electro-plating• Anomalous effects
CHART OF THEORETICAL VOLUME GRATING
COMPARISON STANDARD DCG VS RESIST
DCG SURFACE GRATINGS
DCG VS CASTING
RESIST VS CASTING OF DCG
SEM PHOTO OF SURFACE DCG
ANOMOLOUS EFFECTS
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