Abstract
As explained in Chap. 16, a lens is a kind of phase shifter depending on incident angle of optical ray to the lens. In this section, we derive the formula of the phase shift. Let us start with the function of a convex lens.
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Notes
- 1.
Previously, another definition of the amount of defocus such as Δf > 0 for underfocus was used. Recently, many researchers change to use the present definition Δf > 0 for overfocus.
- 2.
- 3.
These lattice fringes are named “nonlinear lattice fringes .” The narrowest lattice fringes formed between the direct beam and diffracted one, that is, “linear lattice fringes ” are of 64 pm, which are formed by the interference between 000 wave and 620 waves of gold (Akashi et al. 2005).
It is considered that the value may come up to the limitation of the linear imaging.
- 4.
The damping functions of linear and nonlinear terms were discussed also in relation to the channeling theory for HRTEM imaging by Van Aert et al. (2010).
- 5.
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Tanaka, N. (2017). Contrast Transfer Function of a Transmission Electron Microscope. In: Electron Nano-Imaging. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56502-4_17
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DOI: https://doi.org/10.1007/978-4-431-56502-4_17
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