Print Email Facebook Twitter Optical absorption sensing with dual-spectrum silicon LEDs in SOI-CMOS technology Title Optical absorption sensing with dual-spectrum silicon LEDs in SOI-CMOS technology Author Dutta, S. (TU Delft Dynamics of Micro and Nano Systems) Steeneken, P.G. (TU Delft Dynamics of Micro and Nano Systems) Verbiest, G.J. (TU Delft Dynamics of Micro and Nano Systems) Date 2020 Abstract Silicon p-n junction diodes emit low-intensity, broad-spectrum light near 1120 nm in forward bias and between 400-900 nm in reverse bias (avalanche). For the first time, we experimentally achieve optical absorption sensing of pigment in solution with silicon micro LEDs designed in a standard silicon-on-insulator CMOS technology. By driving a single LED in both forward and avalanche modes of operation, we steer it's electroluminescent spectrum between visible and near-infrared (NIR). We then characterize the vertical optical transmission of both visible and NIR light from the LED through the same micro-droplet specimen to a vertically mounted discrete silicon photodiode. The effective absorption coefficient of carmine solution in glycerol at varying concentrations were extracted from the color ratio in optical coupling. By computing the LED-specific molar absorption coefficient of carmine, we estimate the concentration (∼0.040 mol L-1) and validate the same with a commercial spectrophotometer (∼0.030 mol L-1). With a maximum observed sensitivity of ∼1260 cm-1mol-1L, the sensor is a significant step forward towards low-cost CMOS-integrated optical sensors with silicon LED as the light source intended for biochemical analyses in food sector and plant/human health. Subject Avalanche breakdownCMOSlight-emitting diodeOptical sensingSilicon To reference this document use: http://resolver.tudelft.nl/uuid:1aa18647-4bb8-4927-a16d-7a4e37983ad8 DOI https://doi.org/10.1109/SENSORS47125.2020.9278700 Publisher IEEE, Piscataway, NJ, USA ISBN 978-1-7281-6801-2 Source Proceedings IEEE Sensors, SENSORS 2020 Event 2020 IEEE Sensors, SENSORS 2020, 2020-10-25 → 2020-10-28, Virtual, Rotterdam, Netherlands Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type conference paper Rights © 2020 S. Dutta, P.G. Steeneken, G.J. Verbiest Files PDF AAM.pdf 1.94 MB Close viewer /islandora/object/uuid:1aa18647-4bb8-4927-a16d-7a4e37983ad8/datastream/OBJ/view