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We present a new concept for highly-miniaturized spectrometry based on a 5×5 array of tunable hyperchromatic microlenses (HML) which can be used for two-dimensional spatial mapping of spectral data in chemical reaction chambers. Each individual HML consists of a diffractive Fresnel lens combined with a tunable liquid microlens with high spectral dispersion as well as tunable focal length, forming...
We present a highly compact, fully integrated tunable lens for confocal hyperspectral imaging with imprinted diffractive structures on a polydimethylsiloxane (PDMS) membrane. The PDMS membrane was patterned by replication technique with a diffractive optical element (DOE) on quartz glass as master mold. The smallest feature size is 0.8μm the membrane thickness is 100 μm. The liquid-filled lens is...
We present hyperspectral imaging (HSI) systems based on a hyperchromatic confocal approach. Spatial filters are used to separate the spectral components of the light. The necessary multiplexing in time is realized by tuneable optics. In addition, we propose tunable systems with diffractive Alvarez-Lohmann lenses as well as fluidic micro lenses and present a demonstrator using Alvarez-Lohmann lenses...
We present a polyacrylate-based thermopneumati-cally tunable liquid microlens with on-chip actuation for focal length tuning. The use of a polyacrylate membrane allows use of silicone oil as the optical liquid without any swelling or degradation.
A miniaturized optical bench, based on silicon micromachining and with high modularity and flexibility, is presented. This optical microsystem integrates optics, fluidics, high-precision mechanics, and focal length tunable lenses and allows the realization of numerous optical arrangements, such as telephoto and retrofocus systems. Due to its dimensions, the technology may be used for designing a variety...
A highly flexible tunable optical micro-system has been developed and characterized for its use in endoscopic optics, such as optical coherence tomography (OCT). By using two individually tunable lenses, various optical arrangements can easily be realized, allowing great variability in beam shaping. This innovative approach surpasses common endoscopic optics in terms of flexibility, as the measuring...
A design approach and new manufacturing technique for a novel type of stacked fiuidic multi-chamber tunable lenses is presented. The hybrid design with a PDMS fluidic platform and highly accurate silicon inserts for lenses and stops offers flexibility and extensibility, leading to fully functional miniature tunable optical lens systems with the ability to control low-order aberrations. The optical...
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