Patents by Inventor Oleg D. Lavrentovich

Oleg D. Lavrentovich has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10350597
    Abstract: A transport device comprises: a fluid cell comprising parallel substrates; an anisotropic electrolyte disposed in the fluid cell; and electrodes configured to apply an AC electric field to the anisotropic electrolyte disposed in the fluid cell. A substrate of the fluid cell includes a pattern that induces a director distortion pattern in the anisotropic electrolyte disposed in the fluid cell. The director distortion pattern has a gradient configured to induce electrokinetic flow of the anisotropic electrolyte in the fluid cell in response to the AC electric field applied by the electrodes. Cargo, such as particles, gas bubbles, or fluid, is dispersed in the anisotropic electrolyte and transported in the fluid cell by the induced electrokinetic flow of the anisotropic electrolyte. The induced electrokinetic flow may be linear, curvilinear, circular so as to induce mixing, depending on the predesigned director pattern.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: July 16, 2019
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Qi-Huo Wei, Sergij V. Shiyanovskii, Chenhui Peng, Yubing Guo
  • Publication number: 20190048426
    Abstract: A method for controlling self-propelled particles includes providing the particles to a liquid crystalline medium having predesigned local ordering. The method may control at least one of: a local concentration, trajectory, and net flow of self-propelled particles.
    Type: Application
    Filed: August 10, 2018
    Publication date: February 14, 2019
    Applicant: Kent State University
    Inventors: Oleg D. Lavrentovich, Chenhui Peng, Taras Turiv, Yubing Guo, Qi-Huo Wei
  • Publication number: 20180323570
    Abstract: A lasing device includes an active layer comprising a cholesteric liquid crystal material and a laser dye, and a liquid crystal cell including spaced apart substrates defining a cell gap in which the active layer is disposed. The substrates include electrodes arranged to bias the active layer into an oblique helicoidal (ChOH) state. At least one substrate of the liquid crystal cell is optically transparent for a lasing wavelength range of the device.
    Type: Application
    Filed: November 15, 2016
    Publication date: November 8, 2018
    Applicant: Kent State University
    Inventors: Jie Xiang, Andrii Varanytsia, Fred Minkowski, Oleg D. Lavrentovich, Peter Palffy-Muhoray, Corrie T. Imrie, Daniel E. Paterson, John M. Storey
  • Patent number: 9732277
    Abstract: A liquid crystal cell includes substrates defining a gap and electrodes having one of (i) an in-plane geometry generating an electric field parallel with the substrates and (ii) a top-down geometry generating an electric field across the gap between the two spaced apart substrates. A liquid crystal material disposed in the gap between the substrates comprises a chiral nematic material formed by a mixture of: 1-(4-cyanobiphenyl-4?-yl)-6-(4-cyanobiphenyl-4?-yloxy)hexane (CB6OCB) or ?,?-bis(4,4-cyanobiphenyl)nonane (CB9CB) dimeric liquid crystal material; at least one additional dimeric liquid crystal material; and a chiral dopant.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: August 15, 2017
    Assignees: KENT STATE UNIVERSITY, THE UNIVERSITY COURT OF THE UNIVERSITY OF ABERDEEN
    Inventors: Oleg D. Lavrentovich, Jie V. Xiang, Sergij V. Shiyanovskii, Corrie T. Imrie, Daniel A. Paterson, John M. Storey
  • Patent number: 9690161
    Abstract: A diffraction grating comprises a liquid crystal (LC) cell configured to apply an electric field through a cholesteric LC material that induces the cholesteric LC material into a heliconical state with an oblique helicoid director. The applied electric field produces diffracted light from the cholesteric LC material within the visible, infrared or ultraviolet. The axis of the heliconical state is in the plane of the liquid crystal cell or perpendicular to the plane, depending on the application. A color tuning device operates with a similar heliconical state liquid crystal material but with the heliconical director axis oriented perpendicular to the plane of the cell. A power generator varies the strength of the applied electric field to adjust the wavelength of light reflected from the cholesteric liquid crystal material within the visible, infrared or ultraviolet.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: June 27, 2017
    Assignee: KENT STATE UNIVERSITY
    Inventors: Oleg D. Lavrentovich, Sergij V. Shiyanovsii, Jie Xiang, Young-Ki Kim
  • Publication number: 20170144148
    Abstract: A transport device comprises: a fluid cell comprising parallel substrates; an anisotropic electrolyte disposed in the fluid cell; and electrodes configured to apply an AC electric field to the anisotropic electrolyte disposed in the fluid cell. A substrate of the fluid cell includes a pattern that induces a director distortion pattern in the anisotropic electrolyte disposed in the fluid cell. The director distortion pattern has a gradient configured to induce electrokinetic flow of the anisotropic electrolyte in the fluid cell in response to the AC electric field applied by the electrodes. Cargo, such as particles, gas bubbles, or fluid, is dispersed in the anisotropic electrolyte and transported in the fluid cell by the induced electrokinetic flow of the anisotropic electrolyte. The induced electrokinetic flow may be linear, curvilinear, circular so as to induce mixing, depending on the predesigned director pattern.
    Type: Application
    Filed: November 22, 2016
    Publication date: May 25, 2017
    Inventors: Oleg D. Lavrentovich, Qi-Huo Wei, Sergij V. Shiyanovskii, Chenhui Peng, Yubing Guo
  • Publication number: 20160252755
    Abstract: A liquid crystal cell includes substrates defining a gap and electrodes having one of (i) an in-plane geometry generating an electric field parallel with the substrates and (ii) a top-down geometry generating an electric field across the gap between the two spaced apart substrates. A liquid crystal material disposed in the gap between the substrates comprises a chiral nematic material formed by a mixture of: 1-(4-cyanobiphenyl-4?-yl)-6-(4-cyanobiphenyl-4?-yloxy)hexane (CB6OCB) or ?,?-bis(4,4-cyanobiphenyl)nonane (CB9CB) dimeric liquid crystal material; at least one additional dimeric liquid crystal material; and a chiral dopant.
    Type: Application
    Filed: February 25, 2016
    Publication date: September 1, 2016
    Inventors: Oleg D. Lavrentovich, Jie V. Xiang, Sergij V. Shiyanovskii, Corrie T. Imrie, Daniel A. Paterson
  • Patent number: 9400412
    Abstract: An optical modulator includes a liquid crystal cell containing liquid crystal material having liquid crystal molecules oriented along a quiescent director direction in the unbiased state, and a voltage source configured to apply an electric field to the liquid crystal material wherein the direction of the applied electric field does not cause the quiescent director direction to change. An optical source is arranged to transmit light through or reflect light off the liquid crystal cell with the light passing through the liquid crystal material at an angle effective to undergo phase retardation in response to the voltage source applying the electric field. The liquid crystal material may have negative dielectric anisotropy, and the voltage source configured to apply an electric field to the liquid crystal material whose electric field vector is transverse to the quiescent director direction.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: July 26, 2016
    Assignee: KENT STATE UNIVERSITY
    Inventors: Volodymyr Borshch, Sergij V. Shiyanovskii, Oleg D. Lavrentovich
  • Patent number: 9324473
    Abstract: A nanoparticle composition, a device including the nanoparticle composition, and a method thereof are provided. The composition comprises nanoparticles such as Gold nanorods (NR) and electrically charged self-assembled molecular aggregates such as disodium chromoglycate (DSCG) in a common solvent such as water. The nanoparticles are assembled as, for example, side-by-side and end-to-end assemblies of nanorods, through a non-covalent interaction such as anisotropic electrostatic interaction with the electrically charged self-assembled molecular aggregates.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: April 26, 2016
    Assignee: KENT STATE UNIVERSITY
    Inventors: Oleg D. Lavrentovich, Heung-Shik Park
  • Publication number: 20160103351
    Abstract: A phase retarder includes a liquid crystal cell and electrical switching circuitry. The liquid crystal cell contains electrodes and an active layer comprising liquid crystal material stabilized by a polymer network that is shaped by a blue phase using a washout/refill procedure. The electrical switching circuitry is configured to operate the phase retarder at a switching speed of less than 500 microseconds for both rise time and decay time, and in some embodiments is configured to operate the phase retarder at a switching speed of 200 microseconds or less for both rise time and decay time. The polymer network typically has pores of less than or about 200 nm. The liquid crystal material may be a nonchiral nematic liquid crystal material, a chiral nematic liquid crystal material, or a chiral smectic liquid crystal material. In some embodiments the liquid crystal cell does not include an alignment layer.
    Type: Application
    Filed: May 30, 2014
    Publication date: April 14, 2016
    Inventors: Oleg D. Lavrentovich, Jie Xiang
  • Publication number: 20160033806
    Abstract: A diffraction grating comprises a liquid crystal (LC) cell configured to apply an electric field through a cholesteric LC material that induces the cholesteric LC material into a heliconical state with an oblique helicoid director. The applied electric field produces diffracted light from the cholesteric LC material within the visible, infrared or ultraviolet. The axis of the heliconical state is in the plane of the liquid crystal cell or perpendicular to the plane, depending on the application. A color tuning device operates with a similar heliconical state liquid crystal material but with the heliconical director axis oriented perpendicular to the plane of the cell. A power generator varies the strength of the applied electric field to adjust the wavelength of light reflected from the cholesteric liquid crystal material within the visible, infrared or ultraviolet.
    Type: Application
    Filed: July 29, 2015
    Publication date: February 4, 2016
    Inventors: Oleg D. Lavrentovich, Sergij V. Shiyanovsii, Jie Xiang, Young-Ki Kim
  • Publication number: 20160018679
    Abstract: An optical modulator includes a liquid crystal cell containing liquid crystal material having liquid crystal molecules oriented along a quiescent director direction in the unbiased state, and a voltage source configured to apply an electric field to the liquid crystal material wherein the direction of the applied electric field does not cause the quiescent director direction to change. An optical source is arranged to transmit light through or reflect light off the liquid crystal cell with the light passing through the liquid crystal material at an angle effective to undergo phase retardation in response to the voltage source applying the electric field. The liquid crystal material may have negative dielectric anisotropy, and the voltage source configured to apply an electric field to the liquid crystal material whose electric field vector is transverse to the quiescent director direction.
    Type: Application
    Filed: July 16, 2014
    Publication date: January 21, 2016
    Applicant: KENT STATE UNIVERSITY
    Inventors: Sergij V. Shiyanovskii, Volodymyr Borshch, Oleg D. Lavrentovich
  • Patent number: 9182618
    Abstract: A method of electrophoretic movement of liquid droplets/gas bubbles through a liquid crystal utilizes a direct (DC) or alternating (AC) electric field that is applied along the liquid crystal director (for liquid crystals with a positive dielectric anisotropy) or perpendicular to the director (for liquid crystals with a negative dielectric anisotropy). A perpendicular or tilted orientation of the liquid crystal molecules at the surface of the liquid droplet/gas bubble causes distortions, such that the fore-aft (or left-right) symmetry of the liquid droplet/gas bubble is broken. The asymmetric orientation of the liquid crystal around the liquid droplet/gas bubble allows both charged and neutral particles to be transported, even when the liquid droplets/gas bubbles themselves are perfectly symmetric (spherical).
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: November 10, 2015
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Israel Esteban Lazo-Martinez, Oleg P. Pishnyak
  • Publication number: 20150261023
    Abstract: A method of electrophoretic movement of liquid droplets/gas bubbles through a liquid crystal utilizes a direct (DC) or alternating (AC) electric field that is applied along the liquid crystal director (for liquid crystals with a positive dielectric anisotropy) or perpendicular to the director (for liquid crystals with a negative dielectric anisotropy). A perpendicular or tilted orientation of the liquid crystal molecules at the surface of the liquid droplet/gas bubble causes distortions, such that the fore-aft (or left-right) symmetry of the liquid droplet/gas bubble is broken. The asymmetric orientation of the liquid crystal around the liquid droplet/gas bubble allows both charged and neutral particles to be transported, even when the liquid droplets/gas bubbles themselves are perfectly symmetric (spherical).
    Type: Application
    Filed: June 1, 2015
    Publication date: September 17, 2015
    Inventors: Oleg D. Lavrentovich, Israel Esteban Lazo-Martinez, Oleg P. Pishnyak
  • Patent number: 9052562
    Abstract: A method of electrophoretic movement of particles through a liquid crystal utilizes a direct (DC) or alternating (AC) electric field that is applied along the liquid crystal director (for liquid crystals with a positive dielectric anisotropy) or perpendicular to the director (for liquid crystals with a negative dielectric anisotropy). A perpendicular or tilted orientation of the liquid crystal molecules at the surface of the particle causes distortions, such that the fore-aft (or left-right) symmetry of the particle is broken. The asymmetric orientation of the liquid crystal around the particle allows both charged and neutral particles to be transported, even when the particles themselves are perfectly symmetric (spherical).
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: June 9, 2015
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Israel Esteban Lazo-Martinez, Oleg P. Pishnyak
  • Patent number: 8867121
    Abstract: Electrically reconfigurable metamaterial with spatially varied refractive index is proposed for applications such as optical devices and lenses. The apparatus and method comprises a metamaterial in which the refractive indices are modified in space and time by applying one or more electric fields. The metamaterials are electrically controllable and reconfigurable, and consist of metal (gold, silver, etc.) particles of different shapes, such as rods, with dimension much smaller than the wavelength of light, dispersed in a dielectric medium. The metamaterial is controlled by applying a non-uniform electric field that causes two effects: (1) It aligns the metallic anisometric particles with respect to the direction of the applied electric field and (2) It redistributes particles in space, making their local concentration position dependent.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: October 21, 2014
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Andrii B. Golovin
  • Patent number: 8704977
    Abstract: The invention provides a liquid crystal cell and method thereof. The cell comprises two opposed substrates and a surfactant-free lyotropic chromonic liquid crystals (LCLC) material disposed therebetween. By using an ammonium compound with LCLC or surface treatment on the substrates, the alignment of the LCLC material can be manipulated as a homeotropic bulk alignment; or a hybrid bulk alignment in which the LCLC alignment is changed from homeotropic bulk alignment in the vicinity of one substrate to planar alignment in the vicinity of another substrate. The cell can be used in biosensing, detection and amplification of ligands, optical devices, and photovoltaics etc.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: April 22, 2014
    Assignee: Kent State University
    Inventors: Oleg D. Lavrentovich, Yuriy A. Nastyshyn, Vassili G. Nazarenko, Roman M. Vasyuta, Oleksandr P. Boiko, Ye Yin, Sergij V. Shiyanovskii
  • Patent number: 8570460
    Abstract: A liquid crystalline optical medium includes polymer stabilized liquid crystal material. The polymer stabilized liquid crystal material includes a short pitch cholesteric liquid crystal material stabilized by a polymer material. The effective phase retardation of the polarization independent liquid crystal optical medium can be controlled by external (for example, electric and magnetic) fields.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: October 29, 2013
    Assignee: Kent State University
    Inventors: Mingxia Gu, Liubov Kreminska, Andrii Golovin, Oleg D. Lavrentovich
  • Patent number: 8294645
    Abstract: The invention provides a liquid crystal device and method thereof. Subsequent to applying a first electrical voltage on a liquid crystal to induce a reorientation of the liquid crystal, a second electrical voltage with proper polarity is applied on the liquid crystal to assist the relaxation of the reorientation that was induced by the first electrical voltage. The “switch-off” phase of the liquid crystal can therefore be accelerated or temporally shortened, and the device can exhibit better performance such as fast response to on/off signals. The invention can be widely used LCD, LC shutter, LC lens, spatial light modulator, telecommunication device, tunable filter, beam steering device, and electrically driven LC device, among others.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: October 23, 2012
    Assignee: Kent State University
    Inventors: Sergij V. Shiyanovskii, Mingxia Gu, Oleg D. Lavrentovich
  • Publication number: 20120162548
    Abstract: A method of electrophoretic movement of particles through a liquid crystal utilizes a direct (DC) or alternating (AC) electric field that is applied along the liquid crystal director (for liquid crystals with a positive dielectric anisotropy) or perpendicular to the director (for liquid crystals with a negative dielectric anisotropy). A perpendicular or tilted orientation of the liquid crystal molecules at the surface of the particle causes distortions, such that the fore-aft (or left-right) symmetry of the particle is broken. The asymmetric orientation of the liquid crystal around the particle allows both charged and neutral particles to be transported, even when the particles themselves are perfectly symmetric (spherical).
    Type: Application
    Filed: December 13, 2011
    Publication date: June 28, 2012
    Inventors: Oleg D. Lavrentovich, Israel Esteban Lazo-Martinez, Oleg P. Pishnyak