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(Color online) (a) Cross section of the single-component reflecting objective. The focal length is , NA is 0.6, and the working distance is . Symbols used in the figure: and , the radii of the spherical mirrors; , the radius of the polished spherical surface; , the polished flat surface; , the focus of the objective and the center of the curvature of ; , the center of the curvatures of and ; and , the outer and inner diameters of the output light. (b) Optical and cryogenic apparatus used for dark-field imaging of polymer beads at a temperature at .
(Color online) Dark-field images of a polymer bead and their cross sections at . The images of (a) and (b) were taken at and (c) and (d) at . At each temperature, two different wavelengths were employed, for (a) and (c) and for (b) and (d). The alignment of the objective with respect to the sample was kept intact when the wavelength was changed. The FWHM of the central disk is indicated in the figures.
(Color online) Axial chromatic aberration of the single-component reflecting objective measured at room temperature . From the images of a polymer bead, intensity contained in the circle having a diameter of centered at is plotted as a function of [(a) and (b)]. Cross section of the image at is shown at several different at (c) and (d).
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