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Highlights: [•] Effect of volume fractions on change in the size of embedded silver nanoparticles. [•] Surface plasmon resonance study to understand the dipolar interactions. [•] Study provides data for the development of non-equilibrium thermodynamics. [ABSTRACT FROM AUTHOR]

Abstract: Organic nonlinear optical crystal l-asparaginium picrate was subjected to 100MeV Ag8+ ions and 100MeV Si8+ ions. The dielectric properties of the crystals were studied before and after irradiation from 100Hz to 5MHz at various temperatures (308K to 358K). A drastic increase in the dielectric constant is seen due to irradiation. The dielectric constant and dielectric loss increase with increasing irradiation fluence. The UV–vis spectra of the pristine and irradiated samples were recorded and quantified. There is a small shift in absorption edge towards lower wavelength for the irradiated crystals due to the decrease in bandgap of the material. The observed results are discussed in detail. [Copyright &y& Elsevier]