Practical Holography

A near infrared holographic glucose sensor

“…Thus, the concentration of the nanoparticles in the fringes in the polymer affects the diffraction efficiency of the grating (Adleman et al, 2006) via refractive index modulation (Naydenova et al, 2005). The developed metal grains in the opaque fringes ultimately absorb most of the light (coherent laser or white lamp) that is interacting with them and they selectively scatter the rest in the form of standing waves of different potential energy (Bendana et al, 2010;Gaponenko, 2010;Saxby, 2004) thus the reflection efficiency of such fringes is similarly dependent on the characteristics of the metal particles and the fringe periodicity (as well as refractive index) which then influences the interference of the SPR on the holographic replay. The holograms with the near IR replay frequently required subbing in PBS in order to shift from the visible to the near IR.…”

“…The fabrication process in volume holographic gratings proceeds as follows: The coherent laser light wave propagates through the sensitive transparent suspension matrix and the reference wave travelling from the emulsion (at an angle from the mirror that the original wave strikes) create constructive interference (interference patterns-Lippmann layers) when they meet inside the emulsion and record the information within the polymer in a three-dimensional distribution (Bjelkhagen, 1998;Denisyuk, 1972;Saxby, 1994) (Scheme 1). In a metal nanoparticle treated matrix, upon laser irradiation, the nanoparticles align parallel, i.e.…”

“…They have the advantage of reporting the response by the means of a wavelength shift and/or intensity change (Saxby, 2004). Additional advantages of a holographic glucose sensor is that there is no requirement for a re-chargeable power unit co-implanted in the skin that is required by some other glucose sensors, (Kumosa et al, 2010) because the transduced signal is generated by reflected light and also that they do not photobleach thus avoiding the drawbacks of labels, such as fluorophores (Jin et al, 2009).…”

Making optics appealing in Colombia through low-cost experiments with lasers

“…For a 360° view, we use the full-view technique that changes the setup allowing a wider angle of observation, and then creating a 3D image on the film. 3 The hologram is produced by a series of light interference patterns between the light source and the illuminated object, as shown in figure 2. The light used must be coherent and have the same phase, such as the one offered by a laser source.…”

Holographic data visualization: using synthetic full-parallax holography to share information

“…11 Producer Geola uses the description Òi-LumogramÓ, 12 Zebra Imaging Inc Ò3D Holographic PrintsÓ 13 and Ultimate Holography uses the term ÒHoloprintÓ. 14 In this paper ÒSynthetic Display HolographyÓ will by used as to make the method described readily distinguishable from other forms of digital holography.…”