Influence of the shape and orientation of nanoparticles on the spectral characteristics of composite media with gold inclusions

Nikolaev N.E., Muratov D.A., Chekhlova T.K., Kopyeva M.S.

For Russian citation (Opticheskii Zhurnal):

Николаев Н.Э., Муратов Д.А., Чехлова Т.К., Копьева М.С. Влияние формы и ориентации наночастиц на спектральные характеристики композитных сред с включениями золота // Оптический журнал. 2025. Т. 92. № 6. С. 108–116. http://doi.org/10.17586/1023-5086-2025-92-06-108-116

Nikolaev N.E., Muratov D.A., Chekhlova T.K., Kopyova M.S. Influence of the shape and orientation of nanoparticles on the spectral characteristics of composite media with gold inclusions [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 6. P. 108–116. http://doi.org/10.17586/1023-5086-2025-92-06-108-116

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Spectral characteristics of absorption and transmission of composite media containing spherical and ellipsoidal gold nanoparticles. Aim of study. To establish the influence of particle shape, angle of incidence of radiation and light wave polarization on the spectral characteristics of the reflection and transmission coefficients of composite media with spherical and ellipsoidal gold nanoparticles. Method. The Maxwell Garnett effective medium model was used. Main results. Based on the modification of the Maxwell Garnett model taking into account the depolarization factor, an algorithm for calculating the spectral characteristics of the composite medium has been developed. The spectral dependences of the refractive index and extinction coefficient of a composite medium consisting of polystyrene and ellipsoidal gold nanoparticles were calculated. It is found that for particles of ellipsoidal shape, the orientation of the particles in the composite medium plays an essential role. It is shown that the amplitude of the extinction coefficient peak depends on the shape of the particles introduced into the dielectric matrix. The study of the spectral characteristics of the transmittance showed the presence of plasmon resonance absorption, the magnitude of which depended on the shape and orientation of the particles in the composite medium. A spectral shift of the plasmon resonance peak from 518 nm to 640 nm was observed when the shape of the nanoparticles changed. Practical significance. The research results make it possible to predict the optical properties of composite media containing nanoparticles of various shapes, which is important for choosing materials with desired properties in accordance with their purpose.

Keywords:

composite media, metal nanoparticles, spectral characteristics, plasmon resonance, Maxwell Garnett model, refractive index, extinction coefficient

OCIS codes: 160.4236, 160.4670, 160.4760, 310.3840

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