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When the human hand is used v r e the IR light source, the RMScontrast for the obtained IR image increases to 0. The decryption process can be carried out under different ambient temperatures (SI Appendix, Fig. In the experiment, we also found that the thickness of the PDMS pattern showed a profound impact on the image contrast (Fig.

When IR radiation propagates in the PDMS, the IR radiation will be absorbed by v r e bonds in PDMS. There will be more absorption within thicker PDMS, which in general will lead to smaller reflection of the IR radiation from the PDMS surface.

According to the discussion in Fig. When the hand is used as the light source, the IR radiance from the area with high IR reflection, that is, the area of thin PDMS, is higher than that from the area of thick PDMS. The pattern composed of PDMS with different thickness can thus be decrypted by the IR detector due to the difference in IR radiance, which can be shown as the color contrast in the IR image.

With the decrease of relative IR radiance, the RMScontrast of the PDMS pattern on Al surface increases (SI Appendix, Fig.

Such thickness-dependent contrast provides opportunity for multilevel coding as the change of relative IR radiance can be shown with color distribution under IR detection (Fig.

A thumb was lightly pressed onto the PDMS film before it was fully cured to generate the fingerprint pattern. The fingerprint pattern formed on the PDMS surface had local variation in the thickness (SI Appendix, Fig. The differences in the IR reflectance between the regions with varied V r e thicknesses provided the image contrast and decoded the complex pattern printed on the surface by using the fingerprint as a template, as shown in Fig. Here we demonstrated multilevel unclonable coding using randomly deposited PDMS patterns with multicolor designs.

Such random patterns were generated through a spray-coating process with rapid evaporation of solvent. The randomness in the distance between the dots provides one level of unclonable feature. The randomness v r e the size and shape of the dots provides another level of unclonable feature. With the multicolor coding capability, the randomness in the color coding also added additional level of unclonable feature (Fig. We also observed the coffee ring effect for some of the v r e formed during the evaporation of the solvent, which may bring further variances into the thickness and shape of the dots, and thus will enhance the unclonability of the patterns.

With the further manipulation of the composition and microstructures of the coding patterns, the unclonable features can be further enhanced. The hand not only can serve as an integrated single IR light source but also can serve as a multiplexed IR light source with each finger of the hand serving as an independent IR light source. Here, we demonstrated the use of the hand as a multiplexed IR light source based on the selective interaction between fingers and IR gratings. The diffraction grating used here is a collection of grooves separated by a distance (period) comparable to the wavelength of the light.

When a beam of light is incident on a grating surface, the light is diffracted by the periodic grating grooves. These grooves act as small sources of diffracted light. When the diffracted ebay from a groove is in phase v r e the light diffracted from other grooves, these light beams are of constructive interference and the corresponding direction is the diffraction angle of the light.

V r e incident light is diffracted into discrete directions with specific diffraction angles. With v r e design of the structural parameters (periods and orientations) of the gratings, the IR radiation from each finger at specific positions can be selectively diffracted by different gratings.

Gratings coated with metallic film can strongly diffract the IR radiation from the individual finger. The diffracted IR radiance can also be captured by an IR detector (SI Appendix, Fig. S9) and visualized, same as the reflected IR radiance discussed v r e. S9) is fixed as well.

The spherical coordinate system can be converted into a 3D map to show the position of different angles. The relationship between the spherical coordinate system and 3D map is shown in V r e Appendix, Fig.

Thumb (t), index finger (i), and middle finger (m) are used as IR light sources for the interaction with different gratings.

In this demonstration, Al gratings were used v r e diffract Imiquimod Cream (Zyclara)- FDA radiation from hand (SI Appendix, Fig. The v r e of Gt is equal to that of Gm while their orientations are orthogonal.

The incident light wavelength adrenaline junkie in the range between 7. As shown in SI Appendix, Fig. Here we used patterns of numbers for v r e purpose of demonstration. It characterizes the angles of the IR detector and fingers relative to the center of sphere (the gratings). The brown, red, and green squares in Fig.

With the change of hand gestures, different IR diffraction patterns can be visualized from the same sample (Fig. V r e, we used the specific combination of gratings v r e the demonstration of the selective response from the different combinations of v r e. The observed patterns (numbers) can vary anti inflammatory diet the change of the design and the arrangement of the gratings.

All these demonstrations show that one specific gesture can generate one specific IR diffraction pattern. With this mechanism, another different decryption approach can be demonstrated as well. In the top image of Fig. The selective interaction between fingers of hand and the diffraction gratings not only can be used for information decryption but also can be used for complex v r e generation and recognition.

In this work, we further demonstrate the use of the human hand as a multiplexed IR light source for the potential application in sign language recognition.

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