D. PADIYAR J. PADIYAR

Advantages High Efficiency Bragg Selectivity Ease of Development Disadvantages Data not accessible for mass production

Advantages High Efficiency Bragg Selectivity Ease of Development Disadvantages Low Efficiency Specialized developing solutions

Characteristics: High efficiency Mass replicable Volume effects Higher structural rigidity

E_ vol = sin 2 (pnd/lcosf) where n = index modulation d = emulsion thickness l = recording wavelength f = reconstruction angle E_ surf = J 1 2 ((4 p/l)(n-1)(dr)(OR)/I) where J 1 = Bessel function of the first order l = recording wavelength n = index of photoresist dr = differential etch rate I = Reconstruction intensity O = Object intensity R = Reference intensity

 Develop a formula for hard DCG  Maximize the etch rate while minimizing penetration speed.

 Measurement against theory Casting SEM pictures Electro-plating Anomalous effects

 Sensitivity at lower wavelengths  Higher resolution  Mass-producible volume holograms  Development in just water  More Environmentally friendly than resist  Cheaper to produce and ship