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Integrated Collinear Refractive Index Sensor with Ge PIN Photodiodes
Abstract
Refractive index sensing is a highly sensitive and label-free detection method for molecular binding events. Commercial implementations of biosensing concepts based on plasmon resonances typically require significant external instrumentation such as microscopes and spectrometers. Few concepts exist that are based on direct integration of plasmonic nanostructures with optoelectronic devices for on-chip integration. Here, we present a CMOS-compatible refractive index sensor consisting of a Ge heterostructure PIN diode in combination with a plasmonic nanohole array structured directly into the diode Al contact metallization. In our devices, the photocurrent can be used to detect surface refractive index changes under simple top illumination and without the aid of signal amplification circuitry. Our devices exhibit large sensitivities >1000 nm per refractive index unit in bulk refractive index sensing and could serve as prototypes to leverage the cost-effectiveness of the CMOS platform for ultracompact, low-cost biosensors- Text
- Journal contribution
- Medicine
- Microbiology
- Cell Biology
- Neuroscience
- Biotechnology
- Cancer
- Plant Biology
- Space Science
- Chemical Sciences not elsewhere classified
- signal amplification circuitry
- Commercial implementations
- label-free detection method
- optoelectronic devices
- biosensing concepts
- diode Al contact metallization
- CMOS platform
- Ge PIN Photodiodes Refractive index
- on-chip integration
- Few concepts
- index sensor
- plasmon resonances
- index changes
- binding events
- index unit
- plasmonic nanostructures
- devices exhibit
- Ge heterostructure PIN diode
- Integrated Collinear Refractive Index Sensor
- plasmonic nanohole array