North Carolina State University

Fresnel Technologies, Inc.

Alexander Sohn

Thomas A Dow

Erik Zdanowicz

William John Nowak, Jr

Ron Scattergood

Kenneth P Garrard

The subject matter described herein relates to methods and systems for fast imprinting of nanometer scale features in a workpiece. According to one aspect, a system for producing nanometer scale features in a workpiece is disclosed. The system includes a die having a surface with at least one nanometer scale feature located thereon. A first actuator moves the die with respect to the workpiece such that the at least one nanometer scale feature impacts the workpiece and imprints a corresponding at least one nanometer scale feature in the workpiece.

Methods and systems for fast imprinting of nanometer scale features in a workpiece

A polar coordinate-based profilometer includes a base, a rotary stage, a linear stage, and a probe device. The rotary stage is mounted on the base and includes a rotary table rotatable about a vertical axis oriented orthogonal to the base. The linear stage is mounted on the rotary table and is rotatable therewith. The linear stage includes a linear slide member that is translatable along a radial axis orthogonal to the vertical axis. The probe device is mounted on the linear slide member and is translatable therewith. The probe device includes a probe tip that is linearly displaceable along the radial direction and communicates with a linear displacement-sensing transducer. Alternatively, the probe device scans an object without contacting the object. Methods are provided for measuring an object based on polar coordinates, and correcting for misalignment prior to measurement.

Polar coordinate-based profilometer and methods

A microlens array is formed with lenses having many different symmetries to produce a large number of light output pattern shapes. The portions of the microlens array lenslets that direct light into undesirable locations are replaced with additional lenslets that redirect the light to where it is wanted. The microlens array has a plurality of primary lenslets on a substrate, the primary lenslets being curved shapes. Each of the primary lenslets has a surface area and a peripheral region. A plurality of secondary lenslets are at the peripheral regions of the primary lenslets and have surface areas which are smaller than the surface areas of the primary lenslets. The primary lenslets have a first vertical dimension and the secondary lenslets have a second vertical dimension which is smaller than the first vertical dimension. Tertiary lenslets may also be included in the microlens array. In the second of two described embodiments, the secondary and tertiary lenslets present convex cross-sectional shapes.

Microlens array for improved illumination patterns

A motion sensor has a pyroelectric detector, a Fresnel lens array, a reducing lens, and a housing. The detector has two elements located side-by-side and the lens array has a plurality of lenslets which are integrally formed. The reducing lens demagnifies the elements. The reducing lens has grooves which run in parallel directions and face toward the elements. The lens array illuminates the detector by focusing infrared light through the reducing lens and onto the elements. The reducing lens makes the elements appear smaller and closer together. The reduced image of the detector allows the lenslets to be spaced more closely than prior art lenslets, thereby making the angular separation less than the angular separation of prior art sensors. Alternatively, the detector housing may be made smaller while maintaining the same angular separation of prior art sensors. If an object moves between two zones, the sensor detects the movement and triggers an alarm, turns on a light, or initiates some other process.

Growing community of inventors

Fuquay-Varina, NC, United States of America

Alexander Sohn