Definition of backside-illuminated sensor

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PI Physik Instrumente - Microscope Stages LB ROS 11/24

Photonics Dictionary

backside-illuminated sensor: A backside-illuminated (BSI) sensor is an image sensor technology where the light-sensitive elements (typically pixels) are positioned on the opposite side of the sensor substrate from where light enters. This configuration allows light to directly reach the photosensitive regions without being obstructed by layers of circuitry and wiring that would be present in traditional front-illuminated sensors.

Key features and benefits of backside-illuminated sensors include:

Improved light sensitivity: By reducing the distance between the photosensitive area and the incoming light, BSI sensors capture more photons, resulting in better sensitivity, especially in low-light conditions.

Reduced pixel crosstalk: BSI sensors often exhibit lower pixel crosstalk because there are fewer layers between the pixel and the light source, leading to improved color accuracy and dynamic range.

Higher signal-to-noise ratio: Enhanced light sensitivity and reduced crosstalk contribute to a higher signal-to-noise ratio (SNR), resulting in cleaner and more detailed images.

Backside-illuminated sensors are widely used in modern digital cameras, smartphones, and other imaging devices where compact size, low-light performance, and high image quality are critical factors. They represent an advancement over traditional front-illuminated sensors, particularly in applications where capturing clear images in challenging lighting conditions is essential.

Edmund Optics - Manufacturing Services 8/24 MR

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