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Stimulus-responsive light coupling and modulation with nanofiber waveguide junctions.

Ilsun Yoon¹, Kanguk Kim, Sarah E Baker

¹Department of NanoEngineering, University of California, San Diego, La Jolla, California 92093, USA.

|March 28, 2012

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We studied light coupling in tin oxide (SnO2) nanofiber waveguides. Precise gap control enabled efficient light modulation, paving the way for novel chemical sensors.

Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Nanofiber waveguides offer potential for integrated optical devices.
Controlling light coupling at nanoscale junctions is crucial for device functionality.

Purpose of the Study:

To systematically investigate light coupling at overlapping tin oxide (SnO2) nanofiber waveguide junctions.
To explore the feasibility of using these junctions for light modulation and sensing applications.

Main Methods:

Fabrication of SnO2 nanofiber waveguide junctions on silica substrates using micromanipulation.
Precise control of gap separation via polyelectrolyte coatings.
Characterization of light coupling efficiency as a function of gap separation and wavelength.
Numerical simulations using 3D finite-difference time-domain (FDTD) techniques.

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Demonstration of light modulation by exposing junctions to gaseous vapor.

Main Results:

Coupling efficiency strongly depends on gap separation, with significant power transfer fluctuations (0.1 dB/nm) for 2 nm changes.
Experimental results show good agreement with FDTD simulations.
Demonstrated ~95% (450 nm) and ~80% (510 nm) light modulation upon exposure to gaseous vapor.
Developed a nanofiber-based sensing scheme independent of refractive index changes.

Conclusions:

Tin oxide nanofiber waveguide junctions exhibit highly sensitive light coupling characteristics.
These structures can be effectively modulated by environmental stimuli, enabling novel sensing mechanisms.
The developed sensing scheme holds promise for localized, stimulus-responsive devices, including chemical sensors and light modulators.