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Vol. 14-1, Special Issue, March 2012, pp.212-230

 

Bullet

 

Group IV Materials for High Performance Methane Sensing in Novel Slot Optical Waveguides at 2.883 μm and 3.39 μm

 

1 Vittorio M. N. PASSARO, 2 Benedetto TROIA and 1 Francesco DE LEONARDIS

1 Photonics Research Group, Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari

Via Edoardo Orabona n. 4, 70125 Bari, Italy

2 Photonics Research Group and CNIT UdR Bari, Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Via Edoardo Orabona n. 4, 70125 Bari, Italy

E-mail: passaro@deemail.poliba.it

 

 

Received: 9 November 2011   /Accepted: 20 December 2011   /Published: 12 March 2012

Digital Sensors and Sensor Sysstems

 

Abstract: In this paper a detailed investigation of novel photonic sensors based on slot waveguides has been carried out. Appropriate alloys of group IV materials, such as germanium (Ge), silicon (Si), carbon (C) and tin (Sn), are applied in silicon-on-insulator (SOI) technology for homogeneous optical sensing at 2.883 m and 3.39 μm. Electronic and optical properties of group IV alloys have been investigated. In addition, we have designed novel group IV vertical slot waveguides in order to achieve ultra-high sensitivities, as well as good fabrication tolerances. All these features have been compared with well-known SOI slot waveguides for optical label-free homogeneous sensing at 1.55 m. In conclusion, theoretical investigation of ring resonators based on these novel slot waveguides has revealed very good results in terms of ultra high sensing performance of methane gas, i.e., limit of detection ~ 3.610-5 RIU and wavelength sensitivity > 2103 nm/RIU.

 

Keywords: Slot waveguide, Mid-IR gas sensing, Ring resonator, Group IV photonics

 

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