Diffractive optical devices produced by light-assisted trapping of nanoparticles

Abstract

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Recent Achievements on Photovoltaic Optoelectronic Tweezers Based on Lithium Niobate

“…The technique has been also applied to fabricate grating devices on lithium niobate waveguides [39]. Another relevant result that considerably enhances the applicability of particle patterns fabricated by PVT is the possibility of transferring the patterns to other substrates (glass, organic films) as it has been recently reported [36,38,39]. The result of such transferring method is illustrated in Figure 6c,d that shows the initial pattern on the lithium niobate substrate (Figure 6c) and the transferred pattern to a glass substrate (Figure 6d).…”

“…In fact, a remarkable average enhancement factor of 10 is observed for disperse Red 1 organic molecules deposited on the 1D and 2D metallic patterns fabricated in a x-or z-cut substrate, respectively. On the other hand, PVT have been used to fabricate photonic devices such as Fresnel lenses or diffraction gratings [38] by depositing Al nanoparticles on the lithium niobate substrate. In Figure 6a a photograph of the Fresnel zone plate is shown together (Figure 6b) with the light profile at the focus plane where the focusing capability can be clearly observed.…”

“…On the other hand, PVT have been used to fabricate photonic devices such as Fresnel lenses or diffraction gratings [38] by depositing Al nanoparticles on the lithium niobate substrate. In Figure 6a a photograph of the Fresnel zone plate is shown together (Figure 6b) with the light profile at the focus plane where the focusing capability can be clearly observed.…”

Numerical and Experimental Study of Optoelectronic Trapping on Iron-Doped Lithium Niobate Substrate

“…At the state of the art, few papers report numerical simulation and/or experimental results of DEP in Lithium Niobate [24][25][26][27][28][29][30]. In particular theoretical models and numerical results of photorefractivity-induced trapping (an important tool for the evaluation of DEP forces and their spatial distribution) are presented in references [24,25] and [28], while experimental data are reported in reference [26,27].…”

“…In particular theoretical models and numerical results of photorefractivity-induced trapping (an important tool for the evaluation of DEP forces and their spatial distribution) are presented in references [24,25] and [28], while experimental data are reported in reference [26,27]. Additionally, pyroelectricity-induced trapping of water droplets is described in reference [29,30].…”