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A new LC micro-lens array of 128×128 elements circular hole top electrode is proposed, which is fabricated by both the lithography and HCL etching methods. Some valuable results are got in tests. The focal length of LC micro-lens array is 50mum~400mum under operating voltage from 0.2VRMS to 5.0VRMS. The lowest operating voltage of LC micro-lens arr...
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We present a new design for the fabrication of concave gratings with large grating constants for flat-field miniature spectrometers with a wide spectral band. In this new design, one of the two optical paths for the holographic lithography of a curved grating structure with variable line spacing is modified by adding a concave lens in front of the...
Citations
... The LC devices based on carbon nanotube electrodes arrays were also proposed [16,17]. In 2009, we present a LC microlens array structure with electric tunable focal length [18]. In 2013, we designed a LC microlens with focus swing over focal plane [19]. ...
We present a new liquid crystal (LC) microlens structure having ommatidia function, which consists of the overlapped patterned electrode layers. Each electrode layer has a circular electrode array with a different size. Two electrode layers are deposited on the surface of a glass substrate and insulated by thin SiO 2 coating, which act as controlling electrodes. A plane electrode layer deposited on the surface of another glass substrate acts as the base electrode. Two glass substrates are made into a LC cell filled with nematic LC material. When a voltage signal is applied to the controlling electrode and base electrode, each circular unit of the array can focus along the optical axis and has good focusing character, and it behaves as a common microconvex lens. The whole circular array achieves ommatidia optical characters because of many microconvex lenses imaging to the objects simultaneously. Two circular arrays can both image to the objects and have different fields of view, which have extraordinary ommatidia effects. The common optical properties of the LC microlens are also demonstrated experimentally.
A smart spectral imaging detection method based on the integration of an
electrically tunable liquid-crystal Fabry-Pérot microstructure
and a focal plane array is discussed. The layout of the spectral device
is designed effectively and prototypes with working wavelengths in the
range of 800 to 900 nm were fabricated using ultraviolet
photolithography and wet etching. Measurements were carried out with
careful analysis. Based on the results, this paper proposes a smart
spectral imaging array device structure that can potentially obtain the
image of many spectral bands simultaneously in one picture frame. Some
key issues concerning such structures for imaging applications and
calibration are discussed. Without any mechanical parts, this kind of
spectral component exhibits some advantages such as low cost and compact
integration.
