Abstract:
A process for manufacturing a micromechanical structure envisages: forming a buried cavity within a body of semiconductor material, separated from a top surface of the body by a first surface layer; and forming an access duct for fluid communication between the buried cavity and an external environment. The method envisages: forming an etching mask on the top surface at a first access area; forming a second surface layer on the top surface and on the etching mask; carrying out an etch such as to remove, in a position corresponding to the first access area, a portion of the second surface layer, and an underlying portion of the first surface layer not covered by the etching mask until the buried cavity is reached, thus forming both the first access duct and a filter element, set between the first access duct and the same buried cavity.
Abstract:
In accordance with the present invention, accurate and easily controlled sloped walls may be formed using. AlN and preferably a heated TMAH for such purpose as the fabrication of MEMS devices, wafer level packaging and fabrication of fluidic devices. Various embodiments are disclosed.
Abstract:
A method of fabricating a 3 dimensional structure, includes: forming a stack (12) of at least 2 layers of photo resist material having different photo resist sensitivities upon a substrate (14); exposing the stack to beams (22) of electromagnetic radiation or charged particles of different dosages to achieve selective solubility along a height of the stack; and dissolving soluble portions of the stack with a solvent to produce a 3 dimensional structure (24) of desired geometry.
Abstract:
A MEMS device comprises a membrane layer and a back-plate layer formed over the membrane layer. The membrane layer comprises an outer portion and an inner portion raised relative to the outer portion and a sidewall for connecting the inner portion and the outer portion. The sidewall is non-orthogonal to the outer portion.
Abstract:
A method of fabricating a 3 dimensional structure, includes: forming a stack (12) of at least 2 layers of photo resist material having different photo resist sensitivities upon a substrate (14); exposing the stack to beams (22) of electromagnetic radiation or charged particles of different dosages to achieve selective solubility along a height of the stack; and dissolving soluble portions of the stack with a solvent to produce a 3 dimensional structure (24) of desired geometry.
Abstract:
A MEMS device comprises a membrane layer and a back-plate layer formed over the membrane layer. The membrane layer comprises an outer portion and an inner portion raised relative to the outer portion and a sidewall for connecting the inner portion and the outer portion. The sidewall is non-orthogonal to the outer portion.
Abstract:
Aspects of this disclosure relate to driving a capacitive micromachined ultrasonic transducer (CMUT) with a pulse train of unipolar pulses. The CMUT may be electrically excited with a pulse train of unipolar pulses such that the CMUT operates in a continuous wave mode. In some embodiments, the CMUT may have a contoured electrode.
Abstract:
The present invention relates to a device for interfacing nanofluidic and microfluidic components suitable for use in performing high throughput macromolecular analysis. Diffraction gradient lithography (DGL) is used to form a gradient interface between a microfluidic area and a nanofluidic area. The gradient interface area reduces the local entropic barrier to nanochannels formed in the nanofluidic area. In one embodiment, the gradient interface area is formed of lateral spatial gradient structures for narrowing the cross section of a value from the micron to the nanometer length scale. In another embodiment, the gradient interface area is formed of a vertical sloped gradient structure. Additionally, the gradient structure can provide both a lateral and vertical gradient.