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Design and fabrication of Poly(dimethylsiloxane) arrayed waveguide grating.

Jack Sheng Kee1, Daniel Puiu Poenar, Pavel Neužil

  • 1Institute of Microelectronics, A*STAR, Agency for Science, Technology and Research, Singapore. keejacksheng@pmail.ntu.edu.sg

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Researchers developed a four-channel poly(dimethylsiloxane) (PDMS) arrayed waveguide grating (AWG) for visible light. This PDMS AWG shows potential for integration into lab-on-a-chip devices for spectroscopy.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Arrayed waveguide gratings (AWGs) are crucial for wavelength-selective optical signal routing.
  • Poly(dimethylsiloxane) (PDMS) offers unique properties for micro-optical device fabrication, including biocompatibility and ease of processing.
  • Visible light applications require compact and efficient waveguide devices.

Purpose of the Study:

  • To design, fabricate, and characterize a novel four-channel PDMS-based AWG operating in the visible light spectrum.
  • To evaluate the performance metrics of the PDMS AWG, including insertion loss and crosstalk.
  • To explore the potential integration of PDMS AWGs with microfluidic systems for lab-on-a-chip applications.

Main Methods:

  • Fabrication of a single-mode PDMS rib waveguide structure.
  • Design of an arrayed waveguide grating with specific channel spacing and wavelength range (639-644 nm).
  • Characterization of the device's optical performance, including insertion loss and adjacent crosstalk measurements.

Main Results:

  • Successful fabrication of a four-channel PDMS AWG with 1 nm channel spacing.
  • Measured insertion loss of 11.4 dB at the peak transmission wavelength.
  • Adjacent crosstalk below -16 dB achieved.
  • The device has a compact footprint of 7.5 × 15 mm(2).

Conclusions:

  • The developed PDMS AWG demonstrates effective performance for visible light applications.
  • The device's characteristics make it suitable for integration into microfluidic systems.
  • This work highlights the potential of PDMS AWGs for advanced lab-on-a-chip spectroscopic devices.