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Label-free DNA sensing using millimeter-wave silicon WGM resonator
Optics Express
|October 10, 2013
Summary
This study introduces a silicon-based WGM disc resonator for DNA characterization, offering a miniaturized, low-cost bio-sensing solution. The device demonstrates successful testing of single and double-strand DNA, highlighting its potential for mutation detection.
Area of Science:
- Photonics and Biosensing
- Integrated Optics
- Microwave Engineering
Background:
- Dielectric waveguide structures are crucial for advanced sensing applications.
- Whispering Gallery Mode (WGM) resonators offer high sensitivity for detecting minute changes.
- The W-band frequency range presents opportunities for miniaturized, high-resolution devices.
Purpose of the Study:
- To introduce a novel silicon-based WGM disc resonator for bio-sensing.
- To demonstrate the sensor's capability for DNA characterization, including mutation detection.
- To evaluate the sensor's performance in terms of repeatability and selectivity.
Main Methods:
- Fabrication of a planar silicon-based WGM disc resonator.
- Operation of the resonator within the 75-110 GHz (W-band) frequency range.
- Experimental testing with single-strand and double-strand DNA samples.
Main Results:
- Successful characterization of both single-strand and double-strand DNA using the proposed sensor.
- Demonstration of the sensor's integrated, miniaturized, and low-cost nature.
- Validation of measurement repeatability and selectivity through laboratory tests.
Conclusions:
- The silicon-based WGM disc resonator is a viable platform for sensitive DNA bio-sensing.
- The developed sensor is suitable for detecting DNA mutations and characterizing different DNA types.
- The device's ease of fabrication and low cost make it attractive for various bio-analytical applications.
