Ng, WH;
Podoliak, N;
Horak, P;
Wu, J;
Liu, H;
Stewart, WJ;
Kenyon, AJ;
(2015)
Design and fabrication of indium phosphide air-bridge waveguides with MEMS functionality.
In: Sánchez-Rojas, JL and Brama, R, (eds.)
Proceedings of SPIE.
SPIE: Barcelona, Spain.
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Abstract
We present the design and fabrication of a dual air-bridge waveguide structure integrated with MEMS functionality. The structure is designed to function as a tunable optical buffer for telecommunication application. The optical buffer structure is based on two parallel waveguides made of high refractive index material with subwavelength dimensions. They are suspended in air, and are separated by a sub-micron air gap. Due to the fact that the size of the waveguides is much smaller than the wavelength of light that propagates in the structure, a significant fraction of the optical mode is in the air gap between the waveguides. By changing the size of the air gap using MEMS techniques, we can vary this fraction and hence the effective refractive index of the waveguide structure, thus generating tunable optical delay. The optical buffer structure was grown on an InP substrate by molecular beam epitaxy, and the device layer was made of InGaP. An InGaAs layer was sandwiched between the device layer and the substrate to serve as a sacrificial layer. The sub-micron waveguides, their supports in the form of side pillars with tapered shapes in order to minimize optical losses, and the MEMS structures were patterned using electron beam lithography and plasma etching. Electrodes were integrated into the structure to provide electrostatic actuation. After the sample patterning, the waveguide structure was released using HF etch. Our simulations predict that by varying the waveguide separation from 50 nm to 500 nm, we could achieve a change in propagation delay by a factor of two.
| Type: | Proceedings paper |
|---|---|
| Title: | Design and fabrication of indium phosphide air-bridge waveguides with MEMS functionality |
| Event: | Smart Sensors, Actuators, and MEMS VII; and Cyber Physical Systems, 95170A, Barcelona, Spain, May 4, 2015 |
| Location: | Barcelona, Spain |
| Dates: | 04 May 2015 - 06 May 2015 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2178612 |
| Publisher version: | http://dx.doi.org/10.1117/12.2178612 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Optical buffer, waveguide, III-V semiconductors, MEMS, MOEMS, optical delay, actuation. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1522032 |
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