Multifocal optical device with spurious order suppression and method for manufacture of same
First Claim
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1. A multifocal optical device for focusing light traveling parallel to an optical axis of the device, the multifocal optical device comprising:
- a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number, the annular zones including blazed facets; and
absorbing means disposed on a portion of selected ones of the annular zones for absorbing a portion of the light.
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Abstract
A multifocal optical device is provided for focusing light traveling parallel to an optical axis of the device. The multifocal optical device comprises a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number; and an absorbing material disposed on a portion of ones of the annular zones for absorbing a portion of the light.
231 Citations
16 Claims
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1. A multifocal optical device for focusing light traveling parallel to an optical axis of the device, the multifocal optical device comprising:
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a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number, the annular zones including blazed facets; and absorbing means disposed on a portion of selected ones of the annular zones for absorbing a portion of the light. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multifocal optical device for focusing light traveling parallel to an optical axis of the device, the multifocal optical device comprising:
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a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number; and absorbing means disposed on a portion of selected ones of the annular zones for absorbing a portion of the light, the absorbing means being disposed on the selected annular zones to provide a sinusoidal transmission profile along the radial dimension.
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9. A multifocal optical device for focusing light traveling parallel to an optical axis of the device, the multifocal optical device comprising:
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a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number; and absorbing means disposed on a portion of selected ones of the annular zones for absorbing a portion of the light, the absorbing means being disposed on the annular zones to form a binary transmission profile in which a first portion of selected pairs of adjacent annular zones has a first non-zero transmittance value and a second portion of the selected pairs of adjacent annular zones different from the first portion has a second non-zero transmittance value different from the first non-zero transmittance value.
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10. A multifocal optical device for focusing light traveling parallel to an optical axis of the device, the multifocal optical device comprising:
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a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number; and absorbing means disposed on a portion of selected ones of the annular zones for absorbing a portion of the light, the absorbing means being disposed on annular zone pairs in a repetitive profile satisfying the relationship;
space="preserve" listing-type="equation">A(p) =1.0, for R <
p <
S, with 0.0 <
R <
S <
1.0,and A(p) =0.0 for all other values of p where a(p) is a transmission profile of the device as a function of p; R is a first selected parameter; S is a second selected parameter; p is r2 /b2 ; r is a radial distance within a first and second one of the annular zones of the multifocal phase zone plate measured perpendicularly from the optical axis; and b is an outside radius of the second annular zone. - View Dependent Claims (11, 12, 13, 14)
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15. A method for manufacturing a multifocal optical device for focusing light traveling parallel to an optical axis of the device, the method comprising:
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providing a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced from the optical axis in proportion to the square root of q, wherein q is an integer zone number, the annular zones including blazed facets; and disposing an absorbing material on a portion of selected ones of the annular zones for absorbing a portion of the light. - View Dependent Claims (16)
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Specification