Coating for optimising output coupling of em radiation

Details Coating for optimising output coupling of em radiation Coating for optimising output coupling of em radiation

G - Physics

02

F

G02F 1/35 (2006.01)

Patent

CA 2676674

A coating (10) between a nonlinear crystal (5) and a silicon prism coupler (9), prevents transmission of radiation scattered within the crystal (5) by filtering out frequencies outside the silicon bandgap to avoid free carrier absorption, but transmits THz frequencies that correspond to the bandgap.

Selon l'invention, un revêtement (10) disposé entre un cristal non linéaire (5) et un coupleur prismatique en silicium (9) empêche la transmission d'un rayonnement diffusé à l'intérieur du cristal (5) par filtration et élimination des fréquences situées en dehors de la bande interdite du silicium, afin d'éviter l'absorption de porteurs libres, mais il transmet les fréquences THz qui correspondent à ladite bande interdite.

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