摘要:
A method for modulating light, comprising the steps of providing a photorefractive composition containing a sensitizer and a polymer, wherein the sensitizer includes at least one selected from the group consisting of anthraquinone, -nitro-9-fluorenone and 2,7-dinitro-9-fluorenone and irradiating the photorefractive composition with a laser. The photorefractive composition provides a grating without using an external bias voltage.
摘要:
A photorefractive composition that is photorefractive upon irradiation by a near infrared (NIR) laser. The photorefractive composition comprises a sensitizer and a polymer comprising a repeating unit including at least a moiety selected from the group consisting of the formulae (Ia), (Ib) and (Ic), as defined herein. The photorefractive composition can be used in optical devices.
摘要:
An optical device comprising a photorefractive composition configured to be photorefractive upon irradiation by a blue laser. The photorefractive composition comprises a polymer comprising a repeating unit including at least a moiety selected from the group consisting of the formulas (Ia), (Ib) and (Ic), as defined herein.
摘要:
Described herein are optical devices comprising a photorefractive layer and at least two inert layers, such that the photorefractive layer is sandwiched between the two inert layers. The photorefractive layer may include a photorefractive composition that is photorefractive upon irradiation by a laser beam. In some embodiments, the photorefractive composition is formulated such that a grating that is irradiated into the photorefractive composition can be read out of the photorefractive composition without applying an external bias voltage. Furthermore, a grating that is written into the composition may be controlled using thermal treatment.
摘要:
Described herein are compositions that are photorefractive upon irradiation by multiple laser wavelengths across the visible light spectrum. Embodiments of the photorefractive composition comprise a polymer, a chromophore, and a sensitizer, wherein the polymer comprises a repeating unit including at least a moiety selected from the group consisting of the formulae (Ia), (Ib) and (Ic), as defined herein. The photorefractive composition can be used in optical devices.
摘要:
A method for forming a grating in a photorefractive composition comprising the steps of: providing a photorefractive composition containing a sensitizer and a polymer, wherein the polymer includes a first repeating unit which includes a moiety selected from the group consisting of the formulae (Ia), (Ib) and (Ic) as defined herein; and irradiating the photorefractive composition with a near infrared (NIR) laser, wherein the composition provides long grating holding time and the grating signal can be read out without external bias voltage.
摘要:
A photorefractive composition and a photorefractive device comprising the composition are disclosed. The composition is configured to be photorefractive upon irradiation by a laser having a wavelength in the visible light spectrum and comprises a polymer, a non linear optical chromophore, and a plasticizer. In an embodiment, the percentage of polymer recurring units that comprise a charge transport moiety is less than 30%. In an embodiment, the polymer is selected from the group consisting of polycarbonate, polyurea, polyurethane, poly(meth)acrylate, polyester, polyimide, and combinations thereof. Preferably, the composition has a diffraction efficiency of about 30% or greater upon irradiation with a visible light laser.
摘要:
A photorefractive device (100) and method of manufacture are disclosed. The device (100) comprises a layered structure, in which one or more chromophore-doped polymer layers (110) are interposed between a photorefractive material (106) and one or more electrode layers (104). The layered structure can also be interposed between a plurality of substrates (102). In some embodiments, the device (100) exhibits a decreased decay time when applying the biased voltage. Concurrently, the device (100) of the present disclosure utilizes approximately half the bias voltage, advantageously resulting in a longer device life time.
摘要:
A photorefractive composition and a photorefractive device comprising the composition are disclosed. The composition is configured to be photorefractive upon irradiation by a laser having a wavelength in the visible light spectrum and comprises a polymer, a non linear optical chromophore, a plasticizer, and an electrolyte. In an embodiment, the percentage of polymer recurring units that comprise a charge transport moiety is less than 30%. In an embodiment, the electrolyte comprises one or more of ammonium salts, heterocyclic ammonium salts, and phosphonium salts. In an embodiment, the polymer is selected from the group consisting of polycarbonate, polyurea, polyurethane, poly(meth)acrylate, polyester, polyimide, and combinations thereof. Preferably, the composition has a diffraction efficiency of about 25% or greater upon irradiation with a visible light laser.
摘要:
A photorefractive device (100) and methods of its manufacture are disclosed. The photorefractive device (100) comprises one or more transparent electrode layers (104), one or more sol-gel buffer layers (113), one or more polymer buffer layers (105), and a photorefractive layer (106). The one or more sol-gel buffer layer (113) is interposed between the one or more polymer buffer layer (105) and the one or more transparent electrode layer (104). When a bias voltage is applied to the device (100), the device (100) exhibits improvement in electric breakdown strength compared to a similar device without the one or more dielectric sol-gel buffer layers (113). The device (100) can operate at high bias levels with quick rising and decay times and shows higher grating performance under single nanosecond pulse recording conditions.