Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Timothy S Hostetler

Charles Craig Haluzak

William M Tong

James E Ellenson

Charles R Blakely

Wayne E Verley

This invention relates to a method for forming a nano-imprinted photonic crystal waveguide, comprising the steps of: preparing an optical film on a substrate; preparing a template having a plurality of protrusions of less than 500 nm in length such that the protrusions are spaced a predetermined distance from each other; heating the film; causing the template to press against the heated film such that a portion of the film is deformed by the protrusions; separating the template from the film; and etching the film to remove a residual layer of the film to form a nano-imprinted photonic crystal waveguide. Another embodiment of this invention fulfills these needs by providing a method for forming a nano-imprinted photonic crystal waveguide, comprising the steps of: a method for forming a nano-imprinted photonic crystal waveguide, comprising the steps of: preparing an optical film upon a substrate; preparing a template having a plurality of protrusions of less than 500 nm in length such that the protrusions are spaced a predetermined distance from each other; causing the template to modify a shape of the film; applying a UV light to the film and the template such that the film becomes polymerized; separating the template from the film; and etching the film to remove a residual layer of the film to form a nano-imprinted photonic crystal waveguide.

Nano-imprinted photonic crystal waveguide

In one example embodiment, a method of fabricating a fluid ejection device is provided. The method can including fabricating a thinflim structure on a device substrate and forming a peripheral break trench structure in a first surface of the substrate circumscribing a region in which a feed slot is to be formed through the substrate. Subsequently the substrate can be abrasively machined from a second surface of the substrate to the break trench structure to form the feed slot.

Methods of fabricating fluid ejection devices

Techniques for fabricating an inkjet printhead include providing a printhead substrate, fabricating a thinfilm structure on the substrate, forming a break trench in a surface region of the substrate in which a feed slot is to be formed, and subsequently abrasively machining the substrate through the break trench to form the feed slot. The break trench can be formed by an etch process, prior to applying a barrier layer to the thinfilm structure in a preferred embodiment.

Slotted substrates and techniques for forming same

An improved method and apparatus for abrasive jet machining. A special spray nozzle unit is provided which is mounted within a cavity in a retaining block. Each nozzle unit is preferably made of multiple components secured together within the cavity. Also, such unit includes at least two passageways therethrough. In a preferred embodiment, the unit is divided into two heads, each head being substantially triangular with a flattened apex. The retaining block has at least one port therethrough which communicates with the passageways in the heads. A flow of particulate materials into the block passes through the passageways in the heads, simultaneously producing multiple particulate streams. The multiple streams may then be directed toward a substrate in order to simultaneously produce a plurality of openings through the substrate.

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Corvallis, OR, United States of America

Timothy S Hostetler