Details

Autor(en) / Beteiligte

• Kassa-Baghdouche, Lazhar
• Cassan, Eric

Titel

Mid-infrared refractive index sensing using optimized slotted photonic crystal waveguides

Ist Teil von

• Photonics and nanostructures, 2018-02, Vol.28, p.32-36

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A mid-infrared (IR) sensor based on slotted photonic crystal waveguides (SPCW) was designed.•The effective sensitivity of the sensor is enhanced through engineering the input and output slot waveguide interfaces.•The optical sensitivity of the proposed sensor is investigated by 3D-FDTD and 3D-PWE methods in both the spectral and spatial domains based on the refractive index variation of infiltrated liquids.•The sensitivity of the designed SPCW sensor is more than 1150(nm/RIU) with an insertion loss level of −0.3dB.•The designed SPCW structures are the best candidates to realize miniature Mid-IR sensor devices. Slotted photonic crystal waveguides (SPCWs) were designed to act as refractive index sensing devices at mid-infrared (IR) wavelengths around λ=3.6μm. In particular, effort was made to engineer the input and output slot waveguide interfaces in order to increase the effective sensitivity through resonant tapering. A slotted PhC waveguide immersed in air and liquid cladding layers was considered. To determine the performance of the sensor, the sensitivity of the device was estimated by calculating the shift in the upper band edge of the output transmission spectrum. The results showed that the sensitivity of a conventionally designed SPCW followed by modifications in the structure parameter yielded a 510nm shift in the wavelength position of the upper band edge, indicating a sensitivity of more than 1150nm per refractive index unit (RIU) with an insertion loss level of −0.3dB. This work demonstrates the viability of photonic crystal waveguide high sensitivity devices in the Mid-IR, following a transposition of the concepts inherited from the telecom band and an optimization of the design, in particular a minimization of photonic device insertion losses.