Patent ID: 8053730

Claim:
A method of fabricating an infrared sensor, comprising: forming a substrate including a read-out integrated circuit (ROIC); forming first and second pad electrodes over the substrate so as to be coupled to the ROIC; forming a reflection layer over the substrate between the first and the second pad electrodes; forming a sacrificial layer over the reflection layer so as to expose the first and the second pad electrodes; forming a lower protection layer over the sacrificial layer so as to be coupled to the first and the second pad electrodes; forming a first sensing electrode and a second sensing electrode over the reflection layer, forming a sensing layer over the first and the second sensing electrodes and the reflection layer; and forming a first opening and a second opening each passing through the sensing layer, wherein a first end of the first sensing electrode is coupled to the first pad electrode, and a first end of the second sensing electrode is coupled to the second pad electrode, wherein a second end of the first sensing electrode and a second end of the second sensing electrode are configured to be interdigitated to each other, wherein the first opening is formed between the first sensing electrode arranged along a first direction and the second end of the second sensing electrode arranged along a second direction different from the first direction, and wherein the second opening is formed between the second sensing electrode arranged along a third direction and the second end of the first sensing electrode arranged along a fourth direction different from the third direction.