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Design for Distributed Feedback Laser Biosensors Based on the Active Grating Model.

Bowen Wang1, Yi Zhou2, Zhihe Guo3

  • 1Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra Precision Optical Manufacturing, Fudan University, Shanghai 200433, China. 16210720012@fudan.edu.cn.

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Summary
This summary is machine-generated.

This study introduces active gratings in distributed feedback (DFB) lasers for enhanced sensing. Replacing passive gratings with active ones significantly improves the figure of merit (FOM) and biomolecule detection sensitivity.

Keywords:
active gratingbiosensordistributed feedback laser

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Area of Science:

  • Photonics and Optical Sensing
  • Semiconductor Device Physics

Background:

  • Distributed feedback (DFB) lasers are crucial for sensing applications due to their compact size and high sensitivity.
  • Existing theoretical models for DFB laser sensors often rely on passive Bragg gratings, limiting accurate performance prediction, especially for the figure of merit (FOM).

Purpose of the Study:

  • To develop a theoretical model for DFB laser sensors that incorporates active gratings to accurately predict sensor performance metrics like FOM.
  • To investigate the impact of grating parameters on sensor sensitivity and FOM in both passive and active grating configurations.

Main Methods:

  • Theoretical modeling was adapted by incorporating an active grating, represented by the imaginary part of the coupling constant (gain).
  • Numerical simulations were performed to analyze the effects of grating duty cycle and gain value on FOM in active grating sensors.
  • The influence of full width at half maximum (FWHM), duty cycle, and depth on sensor performance was compared between passive and active grating models.

Main Results:

  • The active grating model successfully predicts FOM, overcoming limitations of passive grating models.
  • Systematic investigation revealed that increasing the gain value and optimizing the duty cycle enhances the FOM in active grating sensors.
  • A redshift induced by an increased duty cycle was found to improve biomolecule detection sensitivity by 1.7 times.

Conclusions:

  • The use of active gratings in DFB laser sensors provides a more accurate theoretical framework for performance prediction.
  • Optimizing duty cycle and gain in active gratings is key to achieving higher FOM and enhanced sensitivity for sensing applications.
  • This approach offers a significant advancement for sensitive and reliable biomolecule detection using DFB laser technology.