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    Breaking News

    Holst Centre Constructs New Near-Infrared Vein Detection Sensor

    Takes biometric security to a new level; could eventually enable non-invasive in-body medical imaging.

    Holst Centre Constructs New Near-Infrared Vein Detection Sensor
    The sensor could takes biometric security to a new level. All images courtesy of Holst Centre.
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    Holst Centre07.15.20
    The pattern of veins in your hand is as unique to you as your fingerprint. But unlike your fingerprint, it can't be copied. This makes it potentially a much safer and more secure biometric for identifying individuals than fingerprints. But reading that unique pattern requires the ability to see into your hand.
     
    Holst Centre has been at the forefront of developing large-area image sensors based on organic photodiodes, creating a range of prototypes for visible light and X-rays. It has now extended this technology platform into the near-infrared (NIR). Light in this wavelength domain can pass through skin but is absorbed by hemoglobin in the blood, making it ideal for detecting vein patterns.
     
    Researchers at Holst Centre have combined the organic NIR photodiodes with an oxide thin-film transistor backplane and a focusing lens to create an NIR image sensor measuring 2.4 x 3.6 cm, large enough to image the palm of a hand or multiple fingers at a distance. It's 500-ppi resolution is state-of-the-art for biometric image sensors, enabling high-quality images of the vein pattern. In addition, the sensor achieves external quantum efficiency (EQE) of 40 percent at 940 nm and a dark current of around 10-6 mA/cm2.


    Holst Centre is continuing to refine the technology and push its sensitivity deeper into the NIR region.
     
    "Together with a NIR light source, the prototype image sensor opens the door to contactless biometric security through vein pattern detection. Our thin-film technologies make for extremely thin and potentially flexible sensors that could be easily integrated into existing displays and things like mobile phones or cash machine screens, eliminating the need for separate ID and credit cards," said Daniel Tordera, Senior Scientist at Holst Centre.
     
    Sensor for Non-Spoofable Biometric Identification Easily Integrated in Smartphones
    Having demonstrated the potential of large-area NIR sensors for vein detection, Holst Centre is continuing to refine the technology and push its sensitivity deeper into the NIR region. With photodiodes efficient up to 1100 nm, these latest developments could enable new applications such as eye tracking, quality control in food production, condition monitoring of pipes and non-invasive in-body medical imaging including large area oxygen saturation (SpO2) measurements, conformable optical brain scans and cuffless blood pressure monitoring.
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