Reversible Ultraviolet Imaging With Liquid Crystals

Abstract

Absorption measurements of liquid crystals in the ultraviolet, visible, and infrared

Introduction to Liquid Crystals

“…However, Llt = (tIl 1 / 2 -t-L 1/2)(tI1 1 / 2 + t-L 1/2) ~ 2nLln, n being the refractive index, and using our previous result for S(H), Eq. [125] becomes [126] Rearranging Eq. [126] gives Lln _ Mo(LlX)max: H2 9an(T -Tc *) [127] _ MoTl -2n…”

Technische Anwendungen flüssiger Kristalle

“…Das in den letzten Jahren neu erwachte Interesse an nematischen Substanzen richtet sich hauptsachlich auf die technische Anwendung einiger schon jahrzehntelang be- Ein vollig neues Anzeigesystem steht in Aussicht, wenn man an die Projektionsmoglichkeit der Information denkt, die in eine Fliissigkristall-Zelle elektrisch oder op-tisch eingeschrieben wurde [94]. I n den vorgeschlagenen Anordnungen wird der nematische Fliissigkristall durch einen UV-empfindlichen Photoleiter von einer der beiden Elektroden getrennt.…”

Tunable retarder made of pentaprisms and liquid crystal

“…Molecular orientation can be controlled by using various physical phenomena; e.g., electric field with a suitable frequency [4][5][6], magnetic field [7,8], ultrasonic wave [9], pressure [10], and temperature [11,12]. Optical control is also possible by using either a photosensitive electrode (an alignment coating) [13][14][15][16] or a photosensitive (thermosensitive) LC [17][18][19].…”

“…Optical control of LC has also been studied extensively for creating all-optical switches, holograms, nonlinear optical devices, etc. One approach is to use a photoconductive semiconductor film, e.g., ZnS [13], Bi 12 SiO 20 [14,80], or Si [15,81,82]. If the photoconductive film is inserted between an electrode and an LC layer, an electric field is created in the LC layer only when a light beam is irradiated to the film; i.e., LC reorientation takes place on occasion of light irradiation.…”