Patents by Inventor Qiwen Zhan
Qiwen Zhan 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).
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Publication number: 20220281253Abstract: An opto-thermomechanical (OTM) nanoprinting method allows for additively printing nanostructures with sub-100 nanometer accuracy and for correcting printing errors for nanorepairing under ambient conditions. Different from other existing nanoprinting methods, this method works when a nanoparticle on the surface of a soft substrate is illuminated by a continuous-wave (CW) laser beam in a gaseous environment. The laser heats the nanoparticle and induces a rapid thermal expansion of the soft substrate. This thermal expansion can either release a nanoparticle from the soft surface for nanorepairing or transfer it additively to another surface in the presence of optical forces for nanoprinting with sub-100 nm accuracy. This additive OTM nanoprinting technique paves the way for rapid and affordable additive manufacturing or 3D printing at the nanoscale under ambient conditions.Type: ApplicationFiled: March 7, 2022Publication date: September 8, 2022Inventors: Md Shah Alam, Qiwen Zhan, Chenglong Zhao
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Patent number: 9579191Abstract: An ophthalmic lens system comprises a lens body with a curved outer surface and an assembly including a plurality of spaced apart nanostructures. The assembly covers at least a portion of the curved outer surface.Type: GrantFiled: April 4, 2012Date of Patent: February 28, 2017Assignee: Novartis AGInventors: Xin Hong, David Meadows, Qiwen Zhan, Mutlu Karakelle
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Patent number: 9474143Abstract: A vectorial optical field generator includes a radiation source a modulator surface, a first quarter wave plate, a second quarter wave plate, and an output plane. The radiation source emits an input radiation along a path and the modulator surface is positioned along the path and configured to modulate a phase, an amplitude, a polarization ratio, and a retardation of the input radiation along a fourth area of the modulator surface. The output plane is positioned along the path and receives output radiation resulting from modulating the input radiation with the modulator surface, the first quarter wave plate, and the second quarter wave plate.Type: GrantFiled: June 17, 2015Date of Patent: October 18, 2016Assignee: University of DaytonInventors: Qiwen Zhan, Wei Han, Wen Cheng
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Publication number: 20160055929Abstract: A vectorial optical field generator includes a radiation source a modulator surface, a first quarter wave plate, a second quarter wave plate, and an output plane. The radiation source emits an input radiation along a path and the modulator surface is positioned along the path and configured to modulate a phase, an amplitude, a polarization ratio, and a retardation of the input radiation along a fourth area of the modulator surface. The output plane is positioned along the path and receives output radiation resulting from modulating the input radiation with the modulator surface, the first quarter wave plate, and the second quarter wave plate.Type: ApplicationFiled: June 17, 2015Publication date: February 25, 2016Applicant: University of DaytonInventors: Qiwen Zhan, Wei Han, Wen Cheng
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Publication number: 20120259411Abstract: An ophthalmic lens system comprises a lens body with a curved outer surface and an assembly including a plurality of spaced apart nanostructures. The assembly covers at least a portion of the curved outer surface.Type: ApplicationFiled: April 4, 2012Publication date: October 11, 2012Applicant: Novartis AGInventors: Xin Hong, David Meadows, Qiwen Zhan, Mutlu Karakelle
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Patent number: 8248599Abstract: Special polarization states are generated that have unique focusing properties that may be used to create extremely strong longitudinal fields. Combined with surface plasmon excitation, these polarization states can be used in apertureless near-field scanning optical microscopy systems. A radially polarized beam is directed into a plasmon-generating optical fiber comprising a metal coated, tapered, apertureless tip. The apertureless tip excites surface plasmon waves and direct the surface plasmon waves to the tip when a radially polarized beam propagates along the plasmon-generating optical fiber. An objective lens collects the near field optical signals from a sample positioned adjacent to the apertureless. Potential spatial resolution of the apertureless NSOM could reach beyond 10 nm. Such strong field enhancement allows the development of a reliable nano-Raman system that can measure mechanical as well as chemical compositions of samples with resolution beyond 10 nm.Type: GrantFiled: June 21, 2007Date of Patent: August 21, 2012Assignee: University of DaytonInventor: Qiwen Zhan
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Publication number: 20100141939Abstract: Special polarization states are generated that have unique focusing properties that may be used to create extremely strong longitudinal fields. Combined with surface plasmon excitation, these polarization states can be used in apertureless near-field scanning optical microscopy systems. A radially polarized beam is directed into a plasmon-generating optical fiber comprising a metal coated, tapered, apertureless tip. The apertureless tip excites surface plasmon waves and direct the surface plasmon waves to the tip when a radially polarized beam propagates along the plasmon-generating optical fiber. An objective lens collects the near field optical signals from a sample positioned adjacent to the apertureless. Potential spatial resolution of the apertureless NSOM could reach beyond 10 nm. Such strong field enhancement allows the development of a reliable nano-Raman system that can measure mechanical as well as chemical compositions of samples with resolution beyond 10 nm.Type: ApplicationFiled: June 21, 2007Publication date: June 10, 2010Applicant: University of DaytonInventor: Qiwen Zhan
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Patent number: 6934024Abstract: A solid immersion tunneling ellipsometer and methods relating thereto may include a solid immersion apparatus (e.g., a prism or an objective lens in combination with a solid immersion lens) that facilitates optical tunneling and provide information that can be used in the determination of one or more characteristics (e.g., thickness, index of refraction, etc.) of samples (e.g., thin films, ultrathin films, etc.).Type: GrantFiled: March 14, 2003Date of Patent: August 23, 2005Assignee: Regents of the University of MinnesotaInventors: Qiwen Zhan, James R. Leger
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Publication number: 20040189992Abstract: A solid immersion tunneling ellipsometer and methods relating thereto may include a solid immersion apparatus (e.g., a prism or an objective lens in combination with a solid immersion lens) that facilitates optical tunneling and provide information that can be used in the determination of one or more characteristics (e.g., thickness, index of refraction, etc.) of samples (e.g., thin films, ultrathin films, etc.).Type: ApplicationFiled: March 14, 2003Publication date: September 30, 2004Applicant: Regents of the University of MinnesotaInventors: Qiwen Zhan, James R. Leger
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Patent number: 6798511Abstract: An ellipsometer apparatus and method for use in providing an image of at least a portion of a sample includes an objective lens having a focal plane at which a sample plane of a sample is positioned. Linearly polarized light normal to the sample plane incident on the objective lens is provided, and the incident linearly polarized light is focused onto the sample. At least a portion of the focused incident polarized light is reflected by the sample resulting in reflected light. Spatial filtering is used to modify at least a portion of the incident or the reflected light. An analyzer portion is operable to generate polarization information based on the reflected light.Type: GrantFiled: October 18, 2000Date of Patent: September 28, 2004Assignee: Regents of the University of MinnesotaInventors: Qiwen Zhan, James R. Leger
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Patent number: 6693711Abstract: An ellipsometer and ellipsometry method uses radial symmetry. For example, circularly polarized light may be focused to a spot on a sample using an objective lens and reflected therefrom. A radially symmetric ellipsometric signal based on the reflected light and representative of at least one characteristic of the sample may be attained using a radially symmetric analyzer apparatus, e.g., a pure Polarization rotator such as two half wave plates and a radially symmetric analyzer such as a birefringent lens.Type: GrantFiled: October 18, 2000Date of Patent: February 17, 2004Assignee: Regents of the University of MinnesotaInventors: James R. Leger, Qiwen Zhan
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Publication number: 20030227623Abstract: A solid immersion tunneling ellipsometer and methods relating thereto may include a solid immersion apparatus (e.g., a prism or an objective lens in combination with a solid immersion lens) that facilitates optical tunneling and provide information that can be used in the determination of one or more characteristics (e.g., thickness, index of refraction, etc.) of samples (e.g., thin films, ultrathin films, etc.).Type: ApplicationFiled: March 14, 2003Publication date: December 11, 2003Applicant: Regents of the University of MinnesotaInventors: Qiwen Zhan, James R. Leger