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Refractive index sensing utilizing a cw photonic crystal nanolaser and its array configuration
Shota Kita1, Kengo Nozaki, Toshihiko Baba
1Yokohama National University, Department of Electrical and Computer Engineering, 79-5 Tokiwadai, Hodogayaku, Yokohama 240-8501, Japan.
Optics Express
|June 12, 2008
Summary
We developed novel photonic crystal nanolasers for precise refractive index sensing. These highly sensitive, disposable sensors offer label-free detection for biochips, advancing biosensing technology.
Area of Science:
- Photonics and Nanotechnology
- Sensing and Biosensing
Background:
- Refractive index sensing is crucial for various applications, including biochemical analysis.
- Existing nanocavity-based sensors face limitations in sensitivity and integration.
Purpose of the Study:
- To demonstrate refractive index sensing using photonic crystal point shift nanolasers.
- To develop highly sensitive, spectrometer-free, and disposable nanolaser sensors.
- To enable label-free single molecule detection for biochip integration.
Main Methods:
- Utilized photonic crystal point shift nanolasers for continuous operation at room temperature via photopumping.
- Measured lasing wavelength shifts in response to different liquid immersion.
- Configured nanolasers in an array for spectrometer-free sensing.
Main Results:
- Achieved a 50-dB peak intensity and a spectral linewidth below 26 pm.
- Demonstrated a wavelength-to-index sensitivity of 350 nm/RIU, the highest for nanocavity sensors.
- Confirmed an index resolution of 9.0 x 10(-5), with potential for < 10(-6) resolution.
Conclusions:
- Photonic crystal nanolasers are effective for high-resolution refractive index sensing.
- Proposed spectrometer-free, disposable nanolaser sensors are suitable for biochip integration.
- The technology holds promise for label-free single molecule detection.
