Abstract:
PROBLEM TO BE SOLVED: To provide a broadband objective optical system and a broadband optical imaging system with two imaging paths or more that allow a use of a much shorter wavelength to improve resolving power as to an imaging optical device for sample inspection and avoid a risk of contaminant diffusion on a wafer.SOLUTION: An optical system includes an objective optical system with at least four mirrors and a focus adjustment optical system, and the mirrors include an outermost mirror with an aspect ratio equal to or less than 20:1. The focus adjustment optical system includes a refractive optical element. The objective optical system is configured to provide imaging at a numerical aperture equal to or greater than 0.7 and with central obscuration as low as 35%. The objective optical system may include two mirrors or more and one of the two or more mirrors contains a refractive module that seals off a central opening of the outermost mirror. The broadband imaging system may include one objective optical system and two or more imaging paths and the imaging paths are configured to provide imaging at the numeral aperture equal to or more than 0.7 and a field of view equal to or more than 0.8 mm.
Abstract:
PROBLEM TO BE SOLVED: To determine a peak value in a histogram or sample data stream for data with a lot of noise.SOLUTION: An embodiment includes: fitting a curve modeled based on an orthonormal expansion to a data sequence; acquiring a derivative curve representing change in gradients in the curve fitted to the data sequence; finding at least one root of the derivative curve; calculating a corresponding value on the curve fitted to the data sequence for each of the one root of the derivative curve; and determining a peak value in the data sequence based on the maximum value of the corresponding values calculated for the one root of the derivative curve.
Abstract:
PROBLEM TO BE SOLVED: To electrically ground a substrate through an insulating layer on a surface of the substrate by nondestructive method.SOLUTION: It relates to a device for forming a conductive passage through an insulating layer on a surface of a substrate. A first radiation source is arranged so as to emit radiation to a first region of the insulating layer and a first electric contact is arranged so as to apply a first bias voltage to the first region. A second radiation source is arranged so as to emit radiation to a second region of the insulating layer and a second electric contact is arranged so as to apply a second bias voltage to the second region. Conductivity of the regions is increased by radiation such that a conduction passage is formed through the insulating layer in the regions. In an embodiment, the device can be used in an electron beam apparatus. Another embodiment relates to a method for forming the conductive passage through the insulating layer.
Abstract:
PROBLEM TO BE SOLVED: To provide an ultra-broadband ultraviolet (UV) catadioptric imaging microscope system with wide-range zoom capability.SOLUTION: The microscope system, which comprises a catadioptric lens group and a zooming tube lens group, has high optical resolution in the deep UV wavelengths, continuously adjustable magnification, and a high numerical aperture. The system integrates microscope modules such as objectives, tube lenses and zoom optics to reduce the number of components, and to simplify the system manufacturing process. The preferred embodiment offers excellent image quality across a very broad deep ultraviolet spectral range, combined with an all-refractive zooming tube lens. The zooming tube lens is modified to compensate for higher-order chromatic aberrations that normally limits performance.