Focusing and sensing apparatus, methods, and systems
First Claim
Patent Images
1. An electromagnetic apparatus, comprising:
- a focusing structure oriented to receive input electromagnetic energy and having a nominal depth of focus for output electromagnetic energy; and
a focus-adjusting structure having an axial direction and a traverse direction disposed to receive the output electromagnetic energy and having electromagnetic parameters selected from a group consisting of permittivity and permeability, wherein the electromagnetic parameters provide an extended depth of focus for the output electromagnetic energy greater than the nominal depth of focus and include;
axial electromagnetic parameters; and
transverse electromagnetic parameters having an inverse relationship to the axial electromagnetic parameters.
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Abstract
Apparatus, methods, and systems provide focusing, focus-adjusting, and sensing. In some approaches the focus-adjusting includes providing an extended depth of focus greater than a nominal depth of focus. In some approaches the focus-adjusting includes focus-adjusting with a transformation medium, where the transformation medium may include an artificially-structured material such as a metamaterial.
101 Citations
56 Claims
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1. An electromagnetic apparatus, comprising:
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a focusing structure oriented to receive input electromagnetic energy and having a nominal depth of focus for output electromagnetic energy; and a focus-adjusting structure having an axial direction and a traverse direction disposed to receive the output electromagnetic energy and having electromagnetic parameters selected from a group consisting of permittivity and permeability, wherein the electromagnetic parameters provide an extended depth of focus for the output electromagnetic energy greater than the nominal depth of focus and include; axial electromagnetic parameters; and transverse electromagnetic parameters having an inverse relationship to the axial electromagnetic parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification