Dual membrane single cavity Fabry-Perot MEMS filter
First Claim
1. A single cavity dual membrane Fabry-Perot filter comprising:
- a first membrane device comprising;
a first membrane holding a first mirror structure, a first substrate for supporting the first membrane and defining a first electrostatic cavity between the first membrane and the first substrate, an electrostatic voltage between the first membrane and the first substrate causing deflection of the first membrane relative to the first substrate; and
a second membrane device comprising;
a second membrane holding a second mirror structure, which is opposed the first mirror structure, to thereby define a Fabry-Perot cavity between the first mirror structure and the second mirror structure, a second substrate for supporting the second membrane and defining a second electrostatic cavity between the second membrane and the second substrate, an electrostatic voltage between the second membrane and the second substrate causing deflection of the second membrane relative to the second substrate.
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Abstract
A dual membrane, single cavity MEMS Fabry-Perot filter has a cavity that is defined between two mirror structures that are located on separate MEMS membranes. This configuration can yield a number of advantages. First, the membranes will be typically subject to the same mechanical vibrations, thus, will vibrate together. This vibration, however, will be rejected as common mode, however. Moreover, since the membranes will move in opposed directions in the gravitational field, the dual membrane device is insulated against passband shifts resulting from changes in orientation in the gravitational field. Finally, since each membrane can now be deflected separately, the scanning range is effectively doubled without increases in the size of the electrostatic cavities.
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Citations
12 Claims
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1. A single cavity dual membrane Fabry-Perot filter comprising:
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a first membrane device comprising;
a first membrane holding a first mirror structure, a first substrate for supporting the first membrane and defining a first electrostatic cavity between the first membrane and the first substrate, an electrostatic voltage between the first membrane and the first substrate causing deflection of the first membrane relative to the first substrate; anda second membrane device comprising;
a second membrane holding a second mirror structure, which is opposed the first mirror structure, to thereby define a Fabry-Perot cavity between the first mirror structure and the second mirror structure, a second substrate for supporting the second membrane and defining a second electrostatic cavity between the second membrane and the second substrate, an electrostatic voltage between the second membrane and the second substrate causing deflection of the second membrane relative to the second substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification