Abstract
We demonstrate a tunable on chip polymer waveguide micro ring resonator (MRR) device. The transmission spectrum and extinction ratio are controlled by electrowetting on dielectric (EWOD), via the application of voltage to a droplet. As a result the droplet covers a portion of the MRR waveguide and changes its effective refractive index. This method can be used for efficiently tuning a variety of on chip optical devices, as it offers high index contrast, electrical control and low power consumption.
Highlights
Tunable optofluidic devices (TODs [1]) gain their tunability by modifying the geometry or the refractive index of a fluid interacting with light
(c) From droplet front line positions and ring geometry we found the lengths of WG that is covered with water as a function of the applied voltage and the redshift in resonant wavelengths, according to Eq (1). (d) By using the redshift values and a typical micro ring resonator (MRR) transmission function we calculated the transmission values
Applying voltage to the droplet results in a 0.5 nm redshift in transmission spectrum, which is translated to a modulation depth of up to 31 dB at a fixed wavelength
Summary
Tunable optofluidic devices (TODs [1]) gain their tunability by modifying the geometry or the refractive index of a fluid interacting with light. By applying a voltage to the droplet, its wetting angle is modified, and the droplet covers larger area of the MRR This result in tunability of the effective refractive index of the MRR waveguide, the resonant wavelength and the transmission through the device can be modified. Coupling coefficient can be tuned with the same method by the application of voltage to a droplet inserted from the inlet on the opposite side This way, the refractive index of the cladding in the vicinity of the coupling region between the bus waveguide and the MRR is modified, offering a different type of modulation of the transmission spectrum based on the tunability of the extinction ratio of the device
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