Dielectric confinement effect

What is Dielectric confinement effect?. or could you advise me literature about this?

Thank you.
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dielectric constant (ε) of semiconductor can be changed by deposition on high (or low) ε substrate.
Dielectric confinement is effective reduction of the dielectric constant due to the penetration of electric field into barrier medium with a small dielectric constant.

for further inf.
original paper:
Keldysh, L.V.: Pis’ma Zh. Eksp. Teor. Fiz. 29, 716 (1979). JETPLett. 29, 658, 1979

and very nice prezentation:

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