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