Engineering

Nanoparticle

Materials science

Refractive index

Particle physics

Surface plasmon

Computer science

Wavelength

Resolution (logic)

Surface plasmon polariton

Photonic-crystal fiber

Photonic crystal

Surface plasmon resonance

Laser

Physics

Optical power

Nanotechnology

Optics

Resonance (particle physics)

Electronic engineering

Artificial intelligence

Sensitivity (control systems)

Plasmon

Optoelectronics

Optics Express

Symmetrical dual D-shape photonic crystal fibers (PCFs) for surface plasmon resonance (SPR) sensing are designed and analyzed by the finite element method (FEM). The performance of the sensor is remarkably enhanced by the directional power coupling between the two fibers. We study the influence of the structural parameters on the performance of the sensor as well as the relationship between the resonance wavelengths and analyze refractive indexes between 1.36 and 1.41. An average spectral sensitivity of 14660 nm/RIU can be achieved in this sensing range and the corresponding refractive index resolution is 6.82 × 10-6 RIU. The characteristics of a single D-shape PCF-SPR sensor with the same structural parameters are compared with those of the dual PCFs sensor and the latter has distinct advantages concerning the spectral sensitivity, resolution, amplitude sensitivity, and figure of merits (FOM).

Symmetrical dual D-shape photonic crystal fibers for surface plasmon resonance sensing