Electro-optic switching of dielectrically negative nematic through nanosecond electric modification of order parameter

Abstract

We present experimental studies of nanosecond electric modification of the order parameter

Nanosecond electro-optics of a nematic liquid crystal with negative dielectric anisotropy

“…It is also expected that the relative contributions of the biaxial and uniaxial changes, the amplitude and relaxation times of these changes would be strongly dependent on the molecular structure, as the NEMOP effect is essentially a molecular-scale phenomenon. Indeed, our recent results [13] demonstrate that different mesogenic materials show very different amplitudes of the field-induced NEMOP birefringence that exceed the data presented for CCN-47 by at least one order of magnitude.…”

Nanosecond electro-optics of a nematic liquid crystal with negative dielectric anisotropy

“…It is also expected that the relative contributions of the biaxial and uniaxial changes, the amplitude and relaxation times of these changes would be strongly dependent on the molecular structure, as the NEMOP effect is essentially a molecular-scale phenomenon. Indeed, our recent results [13] demonstrate that different mesogenic materials show very different amplitudes of the field-induced NEMOP birefringence that exceed the data presented for CCN-47 by at least one order of magnitude.…”

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

“…was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in 7 the previously studied HNG715600-100 ( 12   = − , 23 C T =  ) 0.013 n  = was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in the previously studied HNG715600-100 ( 12…”

Novel Plasmonic Data Storage Based on Nematic Liquid Crystal Layers

“…Moreover, the response time of NLC switching using nanosecond EMPO (NEMPO) effect is not proportional to its thickness as in regular Frederiks effect. As reported by [15], the response time of NLC material, MAT-08-192 that has relatively similar characteristics to the NLC material, E7 that employed in the proposed storage is equal ~ 1ns. Thereby, the proposed 2-bit storage may offer sequential writing speed of approximately 1 GB/sec.…”

Nanosecond electro-optics of a nematic liquid crystal with negative dielectric anisotropy

“…It is also expected that the relative contributions of the biaxial and uniaxial changes, the amplitude and relaxation times of these changes would be strongly dependent on the molecular structure, as the NEMOP effect is essentially a molecular-scale phenomenon. Indeed, our recent results [13] demonstrate that different mesogenic materials show very different amplitudes of the field-induced NEMOP birefringence that exceed the data presented for CCN-47 by at least one order of magnitude.…”

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

“…was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in 7 the previously studied HNG715600-100 ( 12   = − , 23 C T =  ) 0.013 n  = was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in the previously studied HNG715600-100 ( 12…”

Novel Plasmonic Data Storage Based on Nematic Liquid Crystal Layers

“…Moreover, the response time of NLC switching using nanosecond EMPO (NEMPO) effect is not proportional to its thickness as in regular Frederiks effect. As reported by [15], the response time of NLC material, MAT-08-192 that has relatively similar characteristics to the NLC material, E7 that employed in the proposed storage is equal ~ 1ns. Thereby, the proposed 2-bit storage may offer sequential writing speed of approximately 1 GB/sec.…”

Nanosecond electro-optics of a nematic liquid crystal with negative dielectric anisotropy

“…It is also expected that the relative contributions of the biaxial and uniaxial changes, the amplitude and relaxation times of these changes would be strongly dependent on the molecular structure, as the NEMOP effect is essentially a molecular-scale phenomenon. Indeed, our recent results [13] demonstrate that different mesogenic materials show very different amplitudes of the field-induced NEMOP birefringence that exceed the data presented for CCN-47 by at least one order of magnitude.…”

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

“…was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in 7 the previously studied HNG715600-100 ( 12   = − , 23 C T =  ) 0.013 n  = was achieved under the applied field 170 V/μm E = [12], while the same n  in GPDA200 is achieved already at E= (11-33) V/μm, depending on the temperature, Fig. 3(e).…”

“…The field-induced birefringence n  in the MEMOP effect in GPDA200 is significant and is achieved at electric fields that are by an order of magnitude lower than those reported previously for NEMOP in NLCs with a negative dielectric anisotropy [10][11][12]. For example, in the previously studied HNG715600-100 ( 12…”

Novel Plasmonic Data Storage Based on Nematic Liquid Crystal Layers

“…Moreover, the response time of NLC switching using nanosecond EMPO (NEMPO) effect is not proportional to its thickness as in regular Frederiks effect. As reported by [15], the response time of NLC material, MAT-08-192 that has relatively similar characteristics to the NLC material, E7 that employed in the proposed storage is equal ~ 1ns. Thereby, the proposed 2-bit storage may offer sequential writing speed of approximately 1 GB/sec.…”