Abstract:
Zoom lens systems and methods for imaging incoming rays over a range of ray angles are disclosed. The incoming rays are characterized by at least phase. The zoom lens system includes an optical axis and is characterized by a plurality of modulation transfer functions (MTFs) corresponding at least to the range of ray angles. The zoom lens system includes an optical group disposed along the optical axis, including at least one variable optical element that has a variable focal length selectable between at least two distinct focal length values. The optical group also includes a wavefront coding element. The wavefront coding element alters at least the phase of the incoming rays, such that the plurality of MTFs corresponding to the range of ray angles, for each one of the two distinct focal length values, are less sensitive to misfocus-like aberrations than a corresponding system without the wavefront coding element.
Abstract:
In a detector system for receiving incoming electromagnetic radiation having a range of chief ray angles (CRAs) that is limited by a stop of the imaging optics, an improvement includes a corrective element that cooperates with imaging optics to ensure that chief rays over the range of CRAs fall within a cone of acceptance angles of the detector. The corrective element may be a tilted lenslet, a diffractive element, a refractive element, a discretized refractive element or a subwavelength structure. A detector system collects a range of chief rays from imaging optics. The system includes an array of detectors, each having a cone of acceptance angles, and a corrective element having one of: an array of lenslets including at least one tilted lenslet; a diffractive element; a refractive element; a discretized refractive element; and subwavelength structures. The corrective element redirects each chief ray to within the cone of acceptance angles.
Abstract:
The present invention provides improved Wavefront Coding imaging apparatus (100, 800, 1100) and methods composed of optics (102, 802, 1102), wavefront coding (104, 806, 1110), detection (106), and processing (112, 810, 1112) of the detected image. The optics are constructed and arranged to have the characteristic that the transverse ray intercept curves form substantially straight, sloped lines. The wavefront coding corrects for known or unknown amounts of "misfocus-like" aberrations by altering the optical transfer function of the imaging apparatus in such a way that the altered optical transfer function is substantially insensitive to aberrations. Post processing then removes the effect of the coding, except for the invariance with regard to aberrations, producing clear images.
Abstract:
Systems and methods for image data fusion include providing first and second sets of image data corresponding to an imaged first and second scene respectively. The scenes at least partially overlap in an overlap region, defining a first collection of overlap image data as part of the first set of image data, and a second collection of overlap image data as part of the second set of image data. The second collection of overlap image data is represented as a plurality of image data subsets such that each of the subsets is based on at least one characteristic of the second collection, and each subset spans the overlap region. A fused set of image data is produced by an image processor, by modifying the first collection of overlap image data based on at least a selected one of, but less than all of, the image data subsets.
Abstract:
Membrane suspended optical elements include a structured substrate including a plurality of apertmes defined therein and an array of optical elements, each of the optical elements being suspended by membiane within one of the apertures.
Abstract:
Zoom lens systems and methods for imaging incoming rays over a range of ray angles are disclosed. The incoming rays are characterized by at least phase. The zoom lens system includes an optical axis and is characterized by a plurality of modulation transfer functions (MTFs) corresponding at least to the range of ray angles. The zoom lens system includes an optical group disposed along the optical axis, including at least one variable optical element that has a variable focal length selectable between at least two distinct focal length values. The optical group also includes a wavefront coding element. The wavefront coding element alters at least the phase of the incoming rays, such that the plurality of MTFs corresponding to the range of ray angles, for each one of the two distinct focal length values, are less sensitive to misfocus-like aberrations than a corresponding system without the wavefront coding element.
Abstract:
An optical lithography system that has extended depth of focus exposes a photoresist coating on a wafer, and includes an illumination sub-system, a reticle, and an imaging lens that has a pupil plane function to form an aerial image of the reticle proximate to the photoresist. The pupil plane function provides the extended depth of focus such that the system may be manufactured or used with relaxed tolerance, reduced cost and/or increased throughput. The system may be used to form precise vias within integrated circuits even in the presence of misfocus or misalignment.
Abstract:
A system, method and software product to optimize optical and/or digital system designs. An optical model of the optical system design is generated. A digital model of the digital system design is generated. Simulated output of the optical and digital models is analyzed to produce a score. The score is processed to determine whether the simulated output achieves one or more goals. One or more properties of at least one of the optical model and the digital model is modified if the goals are not achieved. The analyzing, processing and modifying is repeated until the goals are achieved, and an optimized optical system design and optimized digital system design are generated from the optical and digital models.
Abstract:
A simple and inexpensive wide-angle zoom lens (305, 405) with as few as two plastic elements codes the wavefront that is produced by the imaging system such that the imaging system is invariant to aberrations that are related to misfocus. Signal processing (310, 410) is then used to decode the wavefront to form the final image. A first type of zoom lens configuration uses as few as two lens elements (302, 304). In these configurations, the image processing is modified to take into account the changing point spread function (PSF) of the system (307). A second type of zoom lens configuration that uses more than two lenses requires no modification of the processing.
Abstract:
The present invention provides extended depth of field or focus to conventional Amplitude Contrast imaging systems (100). This is accomplished by including a Wavefront Coding element (422) in the system to apply phase variations to the wavefront transmitted by the Phase Object (408) being imaged. The phase variations induced by the Wavefront Coding mask code the wavefront and cause the optical transfer function to remain essentially constant within some range away from the in-focus position. This provides a coded image (418) at the detector (420). Post processing (424) decodes this coded image, resulting in an in-focus image over an increased depth of field.