Abstract
Holographic volume phase gratings are recorded in an epoxy-based, free-surface, volume holographic recording material. Light-induced gratings are formed by photo-triggered mass migration caused by component diffusion. The material resolution enables a wide range of pattern spacings, to record both transmission and reflection holograms with many different spatial frequencies. An optimum spatial frequency response is found between the low spatial frequency roll-off and the high spatial frequency cut-off. The influence of the energy density of exposure on the spatial frequency response is investigated. Secondary volume holographic gratings (parasitic gratings) are observed in the high frequency range. The possibility of distinguishing the regular grating from the secondary grating is discussed in the form of probe wavelength detuning.
Highlights
Photosensitive polymers represent a interesting group among stimuli-responsive polymeric materials, standing out due to their ability to be applied in a non-invasive and controlled manner [1]
Developing a novel material entails the optimization of the material response, which refers to the ability of a photosensitive material to transfer the interference pattern of exposure into a permanent modulation of optical properties during the recording process
The epoxy-based host–guest material system is suitable for a wide range of applications, diffractive optical elements host–guest material system is suitable for a wide range of applications, from diffractive optical in the very low spatial frequency range to reflection gratings in the high spatial frequency range elements in the very low spatial frequency range to reflection gratings in the high spatial frequency
Summary
Photosensitive polymers represent a interesting group among stimuli-responsive polymeric materials, standing out due to their ability to be applied in a non-invasive and controlled manner [1]. Light as a stimuli entails optical structuring by the application of volume holography as a single-step method for manufacturing 3D diffractive micro- and nanostructures [2]. Some of the many possible uses for volume holographic materials are as diffractive optical elements for applications related to security purposes and holographic-based memories, self-written waveguides, wavelength-selective devices, solar energy concentrators, and multifunctional materials [3,4,5,6]. Volume holographic grating formation in photosensitive polymers can be attributed to an interplay of polymerization and diffusion, induced by spatially modulated exposure. The hologram is formed as a periodic modulation of optical properties—usually the refractive index—according to the recording light pattern [4,7]. For an illustration of the grating formation mechanism see Section
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
