Wafer level packaged infrared (IR) focal plane array (FPA) with evanescent wave coupling
First Claim
1. A structure for detecting electromagnetic radiation having a predetermined wavelength, comprising:
- a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation;
a cover wafer having a region thereof transparent to the electromagnetic radiation for passing the electromagnetic radiation through the transparent region onto a r;
mrfoce of the sensing element;
a bond gap spacer structure for supporting the surface of the sensing element from an opposing surface of the transparent region of the cover wafer a predetermined distance less than a fraction of the predetermined wavelength when the cover wafer is bonded to the device wafer, wherein the bond gap spacer forms a gap between the surface of the sensing element and the opposing surface of the transparent region of the cover wafer to enable evanescent wave coupling across the gap.
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Accused Products
Abstract
A structure for detecting electromagnetic radiation having a predetermined wavelength. The structure includes a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation. A cover wafer is provided having a region thereof transparent to the electromagnetic radiation for passing the electromagnetic radiation through the transparent region onto a surface of the sensing element. A bond gap spacer structure is provided for supporting the surface of the sensing element from an opposing surface of the transparent region of the cover wafer a distance less than a fraction of the predetermined wavelength when the cover wafer is bonded to the device wafer.
57 Citations
14 Claims
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1. A structure for detecting electromagnetic radiation having a predetermined wavelength, comprising:
- a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation;
a cover wafer having a region thereof transparent to the electromagnetic radiation for passing the electromagnetic radiation through the transparent region onto a r;
mrfoce of the sensing element;
a bond gap spacer structure for supporting the surface of the sensing element from an opposing surface of the transparent region of the cover wafer a predetermined distance less than a fraction of the predetermined wavelength when the cover wafer is bonded to the device wafer, wherein the bond gap spacer forms a gap between the surface of the sensing element and the opposing surface of the transparent region of the cover wafer to enable evanescent wave coupling across the gap.
- a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation;
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2. A structure for detecting electromagnetic radiation having a predetermined wavelength, comprising:
- a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation;
a bulk silicon cover wafer having a region thereof transparent to the electromagnetic radiation for passing the electromagnetic radiation through the transparent region onto a surface of the sensing element;a bond gap spacer structure for supporting the surface of the sensing element from an opposing surface of the transparent region of the bulk silicon cover wafer a predetermined distance less than a fraction of the predetermined wavelength when the cover wafer is bonded to the device wafer, wherein the bond gap spacer forms a gap between the surface of the sensing element and the opposing surface of the transparent region of the cover wafer to enable evanescent wave coupling across the gap. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- a device wafer having a sensing element disposed on a predetermined region of a surface of the device wafer responsive to the electromagnetic radiation;
Specification