In this work, a simple method is introduced for estimating the number of the nanoparticles in an active sample based on random laser theory. The sample includes nanoparticles which are distributed randomly. Because of multiple scattering random laser action can occurs when the sample is pumped optically. Here, one-dimensional random laser system is considered and the sample changes are added to the system by changing the number or size of layer. The spectral emission of the sample is calculated by transfer matrix method. The statistical behavior of output emission spectrum is achieved by calculating the averaged spectrum from many random realizations. The results of simulation shows that changes in the number of nanoparticles (or in the averaged size) can be estimated from the statistical random laser output emission and averaged lasing wavelength. This proposed method is fast, non-contact, and needs to a simple setup. Also, it can be used for biological and chemical medium for analysis of different parameters which effect on the spectral random emission.

Date Published: 26 June 2017
PDF: 7 pages
Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 103301L (26 June 2017); doi: 10.1117/12.2270275

Published in SPIE Proceedings Vol. 10330:
Modeling Aspects in Optical Metrology VI
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)