Dynamic filter structures

Details Dynamic filter structures Dynamic filter structures

1984-02-21

2000-11-07

Moskowitz, Nelson

Optical: systems and elements

Absorption filter

359350, 359572, 359584, G02F 103, G02B 530, G01S 1389

Patent

active

061445126

ABSTRACT:
An electromagnetic wave interactive structure is provided for forming a transmitted electromagnetic wave response which is a function of the frequency of the incident wave. A phase transition material selected from the transition-metal oxides, dynamic nonlinear materials, the rare earth monochalcogenides and the organometallics is provided in geometric relationship with a fixed metallic structure. The phase transition material is then switched between a dielectric phase and a metallic phase to alter the response of the composite structure. Thus, an inductive mesh may be switched to a reflective surface (FIG. 8); an inductive band-pass changed to a reflective surface (FIG. 9); a capacitive band-stop response to an inductive band-pass response (FIG. 10); a capacitive band-stop response changed to a reflective surface (FIG. 11); a capacitive mesh response to an inductive band-pass response (FIG. 12); and a capacitive band-stop response switched to an inductive mesh response (FIG. 13). The ability to switch the response characteristics of an electromagnetic wave interactive structure provides useful applications in such devices as optical hardening systems, agile aperture devices and polarizing devices using bi-refringent structures.

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