Large nonlinear absorption in single aggregate of silver nanoparticles observed with z-scan imaging technique

Hendry Izaac Elim

doi:10.1063/5.0062832

Abstract

Although nonlinear optical spectroscopy of nanostructures, nanomaterials, and nanomedicines has been widely used to observe and study the nature of nonlinear optical (NLO) phenomena, the field has to improve for the single nanostructure system. However, it is extremely difficult to investigate the nonlinear optical behaviors of single nanostructure materials because the optical setup used in the experiment has to obligate a high resolution imaging arrangement and overcome the diffraction limit problem. This paper presents that a newly modified z-scan technique with imaging as a starting point for nonlinear optics measurement technology has been successfully implemented to investigate silver nanoparticle aggregation. Such single aggregation with a diameter of ∼1.56 µm made from silver nanoparticles has been precisely observed with an imaging profile on an aggregation target with a large nonlinear absorption coefficient of 8.90 × 109 cm/GW. This technique suggests a wide impact application for a better understanding and knowledge in conjunction with the origin of NLO behavior in any nanomaterials, including nanomedicines.

Highlights

The general challenge in investigating the origin of the ultrasensitive response from a single nanoparticle or nanostructure has been focused on a smart optical setup in the last few decades.1–5 The nonlinear optical properties of such a single nanostructure need a single optical setup used in the experiment sustained by an integrated high resolution imaging part1–3 so that it can overcome the diffraction limit.4,5 the nonlinear optical characters in metallic nanomaterials have been intensively studied by many different multidisciplinary scientists6–16 due to their tremendous nanotechnology implementations
In the z-scan imaging experiments technically carried out by using the setup based on Fig. 1, the employed objective lens 1 (OL1) has a focal length of 8.8 mm, producing a focused beam with a beam waist of ω0 = ∼8 μm
The thickness of the single aggregate of Ag NPs deposited on a glass substrate is ∼1.56 μm, which is shorter than the Rayleigh range (z0) of the focused beam (z0 = πω02/λ = 770 μm), a requisite that simplifies the analysis of the z-scan results

Summary

Introduction

The general challenge in investigating the origin of the ultrasensitive response from a single nanoparticle or nanostructure has been focused on a smart optical setup in the last few decades. The nonlinear optical properties of such a single nanostructure need a single optical setup used in the experiment sustained by an integrated high resolution imaging part so that it can overcome the diffraction limit. the nonlinear optical characters in metallic nanomaterials have been intensively studied by many different multidisciplinary scientists due to their tremendous nanotechnology implementations. The general challenge in investigating the origin of the ultrasensitive response from a single nanoparticle or nanostructure has been focused on a smart optical setup in the last few decades.. The nonlinear optical properties of such a single nanostructure need a single optical setup used in the experiment sustained by an integrated high resolution imaging part so that it can overcome the diffraction limit.. An attractive single nanostructure or a nanochip is very interesting to study for the future engineering nanorobot industry so that it may support, for example, an expanded space exploitation with various multitasking nanotechnology devices, such as a healing system through the injection of nanomedicine in the human body, high sensitivity metallic core–shell nanosensors, and many other ultralow energy nanodevices with their ultrafast nonlinear optical (NLO) properties..

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Conclusion