Host: Technical University of Darmstadt (TUDA)
Secondment: Technical University of Denmark (DTU) and Superlum Diodes (SUP)
PhD project: Large tuning range lasers based on FP-MEMS and MEMS-VCSEL for OCT applications
The aim of our research is to develop high tunable fabry-Perot filters to be used as swept source for SS-OCT. These devices consists in a plane concave cavity formed by Distributed Bragg (DBR) reflectors of SiN and SiO. They are fabricated in cleanroom by using different deposition and etching techniques achieving a cavity with two electrodes, one over each mirror, that allows a tunability of the cavity length in an electrothermal or electrostatic way that would provide the sweeping behavior of the device.
In order to achieve our goal some of the objectives that we have to full fill are the improvement of SiN recipes in order to obtain a high contrast in refractive index of the DBR layers, this leads to a longer reflectivity band and a reduction of the DBR mass which means ins increment in the tuning speed, optimization of the geometry of the filters, to make them more stable and to reduce the cavity length in order to obtain a higher free sprectral range and last introducing these devices in a SS-OCT system and obtain an image. The wavelength range that our FP-filter are used is centered at 1550 nm.
Completed workshops, Seminars, and Conferences:
- 25th Congress of the International Commission for Optics (ICO), 05 – 09 Sep 2022
- 2nd NETLAS Event, Winter School, DTU, Denmark, 1-4th March 2022
- 3rd NETLAS Event, Autumn School, Technical University of Darmstadt (TUDA), Germany, 4-7th October 2022
- SPIE Photonics West, 28 January – 2 February 2023
- 4th NETLAS Event, NETLAS Conference in conjunction with Markus Pessa International Summer School “New Frontiers in Optical Technologies”, Tampere, Finland, August 7 – 11, 2023
Publication:
- I. Rodríguez Lamoso, A. Martínez Jiménez, J. Cesar, S. Preu, A. Podoleanu, “Characterization of SiN/SiO2-based MEMS-VCSEL at 1550 nm for optical coherence tomography,” Proc. SPIE 12367, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII, 1236716 (8 March 2023); https://doi.org/10.1117/12.2652961
Previous education: BSc Electrical engineering at university of Vigo, Spain. MSc in Optical Technologies at university of Strathclyde (United Kingdom), with a final thesis on ”Rare-earth doped crystals characterization for remote sensing applications.”
I studied my BSc in electrical engineering in the University of Vigo, Spain. Before submitting my undergraduate project dissertation, I spend two years working in a technical office environment. Particularly, I worked for Couch Perry & Wilkes (CPW) in Nottingham, UK. During this time in England I became fascinated about emerging optical devices that I used every day at work. This led me to start my MSc studies in Optical Technologies in the University of Strathclyde (Glasgow, UK). After such a good time during my MSc I decided that I wanted to start a PhD and focus my career in research, thanks to previous experience I had the opportunity of starting my PhD in the Technical University of Darmstadt.