Abstract:
Optical cross-connect systems (100) involve the general concept of a two dimensional array of micro electromechanical systems (MEMS) tilt mirrors (104) being used to direct light coming from a first optical fiber (110) to a second optical fiber (111). Each MEMS tilt mirror in the two dimensional array can tilt about two non-colinear axes (x,y) and is suspended by a plurality of suspension arms (450) attached to a glass substrate
Abstract:
A stress-balancing layer (130) is formed over portions (122) of a spring metal finger (120) that remain attached to an underlying substrate (101) to counter internal stresses inherently formed in the spring metal finger (120). The (e.g., positive) internal stress of the spring metal causes the claw (tip) (125) of the spring metal finger (120) to bend away from the substrate (101) when an underlying release material is removed. The stress-balancing pad (130) is formed on an anchor portion (122) of the spring metal finger (120), and includes an opposite (e.g., negative) internal stress that counters the positive stress of the spring metal finger (120). A stress-balancing layer (230) is either initially formed over the entire spring metal finger (120) and then partially removed (etched) from the claw portion (125), or selectively deposited only on the anchor portion (122) of the spring metal finger (120). An interposing etch stop layer (325-1) is used when the same material composition is used to form both the spring metal (220) and stress-balancing (230) layers.
Abstract:
Efficient methods for lithographically fabricating spring structures onto a substrate (301) containing contact pads or metal vias (305) by forming both the spring metal and release material layers using a single mask. Specifically, a pad of release material (310) is self-aligned to the spring metal finger (320) using a photoresist mask or a plated metal pattern, or using lift-off processing techniques. A release mask is then used to release the spring metal finger while retaining a portion of the release material that secures the anchor portion of the spring metal finger to the substrate. When the release material is electrically conductive (e.g., titanium), this release material portion is positioned directly over the contact pad or metal via, and acts as a conduit to the spring metal finger in the completed spring structure. When the release material is non-conductive, a metal strap is formed to connect the spring metal finger to the contact pad or metal via, and also to further anchor the spring metal finger to the substrate.
Abstract:
A method and system for lithographic printing by controlling the surface energy of a printing plate (12) to affect its hydrophilic and hydrophobic properties. These properties enable the ink to be applied to the printing plate (12) in an imagewise manner and provides for rapid production of images on a recording medium. The lithographic printing plate (12) may be rewritten repeatedly between printing jobs or may even by rewritten between individual recording media.
Abstract:
The invention provides a buffered substrate that includes a substrate, a buffer layer and a silicon layer. The buffer layer is disposed between the substrate and the silicon layer. The buffer layer has a melting point higher than a melting point of the substrate. A polycrystalline silicon layer is formed by crystallizing the silicon layer using a laser beam.
Abstract:
An epitaxial (111) magnesium oxide (MgO) layer, suitable for use as a buffer layer (14), on a (111) surface of a tetrahedral semiconductor substrate (12), and method for its manufacture is described. The article may further include an epitaxial oxide overlayer (16) on the (111) MgO layer. The overlayer (16) may be a conducting, superconducting, and/or ferroelectric oxide layer. The method of producing the epitaxial (111) magnesium oxide (MgO) layer (14) on the (111) surface of a tetrahedral semiconductor substrate (12) proceeds at low temperature. The method may further include steps for forming the epitaxial oxide layer on the (111) MgO layer. The methods include the steps of preparing the (111) surface of a tetrahedral semiconductor substrate for deposition and the low temperature depositing of an MgO layer on the prepared surface. Further steps may include the depositing of the oxide layer over the MgO layer.
Abstract:
A structure includes a semiconducting substrate (12;22;32) on which is formed an epitaxial buffer layer (14;24;34) of MgO and an epitaxial layer (16;26;38) of ferroelectric material or superconducting material or both. The semiconducting substrate (12;22;32) is of the tetrahedral structure type, and may be an elemental or compound material. The MgO buffer layer (14;24;34) on the tetrahedral semiconducting substrate allows epitaxial formation of the subsequent layers, facilitating the formation of a number of novel monolithic devices.