## 3 Results and Discussion  
The experimental results obtained in this work were attained by applying DHM technique from the films generated during the nanoparticle collecting process described in the Section 2.1. Applying the proposed method to diverse thermoplastic materials such as ABS, Carbon Fiber, HIPS, Nylon, PETG, PLA, PP, and TPU, which were divided into four regions, varying the exposure time between each of them for 30 min. Having the Region 1 the shortest exposure time with only half an hour; while Region 4 counted with the longest exposure time with a period of 2 h. This with the aim of capturing films of  
Figure 5: Fourier spectrum distribution of the captured hologram. different thicknesses, which allow analyzing the molecular ordering properties of each material through a defined time period. The photograph of Figure 6a is the thin film of the TPU deposition by performing the procedure described in Section 2.1. Figure 6b shows a zoom area delimited by the red square of the photograph Figure 6a. At the bottom of Figure 6b we attached the profile measurement result of the thin film by DHM for identification zones. Once, the collection of nanoparticle samples was finished (Section 2.1), a reconstruction process of the digital holograms was performed (Section 2.2), applying a reconstruction distance of d = 0.006 mm in Equation (3) for refocusing object and using a reference hologram technique to eliminate aberrations and misalignment of the system [35]. Figure 7 shows the reconstructed amplitude distribution of an Edmund NBS 1963A resolution card, where the zone of interest corresponds to 10 double lines per millimeter. From this pre-process, we attain a lateral resolution of 4 um. Figure 8a, Row 7, shows TPU digital hologram recorded by the optical setup described in Figure 3. The reconstruction process described in Section 2.2 was performed to obtain the measurement results by Equation (4). Next, in Figure 8b, Row 7, we show the amplitude reconstruction of the TPU particles deposition. Finally, Figure 8c, Row 7, it shows the phase reconstruction of the TPU particles deposition. Attached to this figure is the average profile of thin film thickness for a better understanding. Figure 6: (**a**) Photograph of TPU nanoparticles collected, and (**b**) zoom photograph of the thickness distribution of the deposited TPU film sample (Image (**a**)). Figure 7: Amplitude reconstruction of a hologram recorded of a resolution card to determine lateral resolution. Figure 8: Reconstruction of thermoplastics filaments deposition nanoparticles by DHM. The graphs presented in Figure 9 show the average thickness of the films deposited in the vertical direction, as shown in the procedure in Figure 8. Additionally, the refractive index presented in Table 2 was used to realize these two-dimensional graphs [36; 37; 38; 39]. The thermoplastic materials showed differences with the expected behavior related to their union properties during the nanoparticle deposition process on the glass substrate. While materials such as nylon and TPU showed a uniform adhesion, having a consistent relationship between the exposure time and the resultant nanoparticle film, materials such as carbon fiber and PP had an uneven adhesion behavior along the exposure regions. Figure 9: The average thickness of the microparticle film deposited on the collecting area: (**a**) ABS, (**b**) carbon fiber, (**c**) HIPS, (**d**) Nylon, (**e**) PETG, (**f**) PLA, (**g**) PP, (**h**) TPU. Due to the properties of thermoplastic materials, their molecules present agglutination, avoiding the formation of uniform films [40]. These properties mean that plastic materials, in contrast to semiconductor materials such as silicon [41] or metallic materials as chromium [42], do not respect molecular structures in an orderly way. The analysis of the nanoparticles was carried out collectively and focused mainly on identifying their distribution behaviors on the glass substrate used.