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Cap 11 Fotoresisit Uno e Due Fotoni - Scienza dei Materiali

Cap 11 Fotoresisit Uno e Due Fotoni - Scienza dei Materiali

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Assorbimento a due fotoni (TPA)<br />

Definizione e caratteristiche<br />

Intense laser beam<br />

Lens<br />

TPA ∝ I 2<br />

I ∝ Z -2 TPA ∝ Z -4 One photon excitation<br />

Two photon<br />

+ Z<br />

absorbing material<br />

- Z<br />

Two photon excitation<br />

32<br />

• Excitation confinement<br />

• No photodamage of out-of-focus dyes<br />

• Higher penetration depth – NIR excitation<br />

Pho.B.O.S.

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