Mirror structure with single crystal silicon cross-member
First Claim
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1. A method of fabricating a micro mirror, comprising:
- forming a first substrate defining a cavity on a first side of the first substrate;
implanting hydrogen ions to a predetermined depth on a first side of a second substrate;
bonding the first side of the first substrate to the first side of the second substrate; and
cleaving off a portion of a second side of the second substrate.
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Abstract
Hydrogen cleave silicon process for light modulating mirror structure using single crystal silicon as the base cross-member. Existing processes use two critical alignment steps that can contribute to higher actuation voltages and result in lower manufacturing yields. The hydrogen cleave process simplifies the manufacturing process to one step: transferring a thin film of single crystal silicon to the CMOS substrate, resulting in minimal alignment error and providing large bonding area.
95 Citations
37 Claims
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1. A method of fabricating a micro mirror, comprising:
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forming a first substrate defining a cavity on a first side of the first substrate; implanting hydrogen ions to a predetermined depth on a first side of a second substrate; bonding the first side of the first substrate to the first side of the second substrate; and cleaving off a portion of a second side of the second substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A micro mirror, comprising:
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a first layer with a first side and a second side, the first layer having a cavity on the first side; a second layer with a first side and a second side, the first side of the second layer bonded to the first side of the first layer, wherein the second layer is a single piece of single crystal silicon and the second layer further comprises; a base fabricated from a portion of the second layer; a cross-member fabricated from a portion of the second layer substantially aligned with the cavity, the cross-member continuous with and supported by the base, the cross-member suspended over the cavity; a connector pedestal fabricated on the cross-member, the pedestal substantially in the center of the micro mirror; and a mirror plate connected to the connector pedestal such that the mirror plate may rotate about an axis defined by the cross-member. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification