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In this work, we demonstrate the use of tapered optical fibers (TOF) todetect charged particle (ions), irradiated at various energies, fluences andspecies. The single mode tapered optical fiber has been used in various sensingapplications in recent times. Here, tapered optical fibers have been exposed totwo different ion species namely Ar+ and N+ at different energies and differentfluences, respectively. The optical spectrum analyzer (OSA) detects the changesin the free spectral range (FSR), period, and transmission power loss from theion beam irradiated TOFs. The change in the refractive index of the claddingmaterial due to the implanted ions influences the transmission spectra of theTOFs and we could able to detect ions of energy as low as 80 keV. COMSOLsimulation results are employed to explain the observed changes in spectra. Theion beams induced surface modification and defect formation as well as theimplantation in TOF have been predicted using Monte Carlo based 3D TRI3DYNion-solid interaction simulation and corroborated with other experimentalstudies such as scanning electron microscopy and Raman scattering spectroscopy.Such tapered optical fiber-based detection technique will help to developportable device to detect charged particles in space exploration and in nuclearreactors.

Tapered Optical Fiber-based Detection of Charged Particle Irradiation in Space Exploration and Nuclear Reactors