Patents by Inventor Bo Zhen
Bo Zhen 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: 20230084321Abstract: Nonlinear on-chip optical devices using AlScN are described herein. In one aspect, an optical component having nonlinear characteristics can include a first substrate defining a refractive index; and a nonlinear layer, the nonlinear layer disposed on the first substrate, the nonlinear layer comprising an amount of scandium (Sc), and the nonlinear layer defining a refractive index that is higher than the refractive index of the first substrate.Type: ApplicationFiled: July 29, 2022Publication date: March 16, 2023Inventors: Valerie J. Yoshioka, Jian Lu, Zichen Tang, Jicheng Jin, Roy H. Olsson, III, Bo Zhen
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Publication number: 20190339522Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: ApplicationFiled: March 26, 2018Publication date: November 7, 2019Inventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Patent number: 10352856Abstract: Ultra-thin conductors are employed to generate plasmon fields near the surface of the conductors. Emitters, such as atoms, molecules, quantum dots, or quantum wells, in the plasmon fields can emit and absorb light via transitions that are otherwise forbidden in the absence of the plasmon fields. Applications using these forbidden transitions include spectroscopy, organic light sources, and broadband light generation. For example, in a spectroscopic platform, an emitter is disposed in the plasmon fields to excite electronic transitions that are otherwise unexcitable. In organic light sources, plasmon fields quench excited triplet states, allowing fast singlet decay with the emission of light. In broadband light generation, strong two-plasmon spontaneous emission of emitters near ultrathin conductors is employed to produce a broad spectrum of light.Type: GrantFiled: December 14, 2016Date of Patent: July 16, 2019Assignee: Massachusetts Institute of TechnologyInventors: Nicholas Rivera, Ido Kaminer, Bo Zhen, Marin Soljacic, John Joannopoulos
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Patent number: 10324237Abstract: A transparent display includes nanoparticles having wavelength-selective scattering (e.g., resonant scattering) to preferentially scatter light at one or more discrete wavelengths so as to create images. The nanoparticles transmit light at other wavelengths to maintain a high transparency of the display. The nanoparticles are disposed in proximity to a thin film, which can enhance the scattering the process by reflecting light back to the nanoparticles for re-scattering or increasing the quality factor of the resonant scattering.Type: GrantFiled: March 31, 2017Date of Patent: June 18, 2019Assignee: Massachusetts Institute of TechnologyInventors: Marin Soljacic, Bo Zhen, Emma Anquillare, Yi Yang, Chia Wei Hsu, John D. Joannopoulos
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Patent number: 9927616Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: GrantFiled: August 16, 2016Date of Patent: March 27, 2018Assignee: Massachusetts Institute of TechnologyInventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Publication number: 20170299149Abstract: A transparent display includes nanoparticles having wavelength-selective scattering (e.g., resonant scattering) to preferentially scatter light at one or more discrete wavelengths so as to create images. The nanoparticles transmit light at other wavelengths to maintain a high transparency of the display. The nanoparticles are disposed in proximity to a thin film, which can enhance the scattering the process by reflecting light back to the nanoparticles for re-scattering or increasing the quality factor of the resonant scattering.Type: ApplicationFiled: March 31, 2017Publication date: October 19, 2017Inventors: Marin SOLJACIC, Bo Zhen, Emma Anquillare, Yi Yang, Chia-Wei Hsu, John D. Joannopoulos
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Patent number: 9724815Abstract: A portable power tool includes a motor housing and a motor mounted in the motor housing. The motor includes a rotary spindle. The portable power tool also includes a trigger configured to be actuated and released to switch on and off the motor. The portable power tool also includes a mechanical brake assembly connected with the trigger and automatically operated by the trigger. Accordingly, the brake assembly releases the spindle when the trigger is activated and brakes the spindle when the trigger is released.Type: GrantFiled: August 11, 2010Date of Patent: August 8, 2017Assignee: Bosch Power Tools (China) Co., Ltd.Inventors: Bo Zhen, Aigui Wang, Songtao Jin
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Publication number: 20170184849Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: ApplicationFiled: August 16, 2016Publication date: June 29, 2017Inventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Publication number: 20170167977Abstract: Ultra-thin conductors are employed to generate plasmon fields near the surface of the conductors. Emitters, such as atoms, molecules, quantum dots, or quantum wells, in the plasmon fields can emit and absorb light via transitions that are otherwise forbidden in the absence of the plasmon fields. Applications using these forbidden transitions include spectroscopy, organic light sources, and broadband light generation. For example, in a spectroscopic platform, an emitter is disposed in the plasmon fields to excite electronic transitions that are otherwise unexcitable. In organic light sources, plasmon fields quench excited triplet states, allowing fast singlet decay with the emission of light. In broadband light generation, strong two-plasmon spontaneous emission of emitters near ultrathin conductors is employed to produce a broad spectrum of light.Type: ApplicationFiled: December 14, 2016Publication date: June 15, 2017Inventors: Nicholas Rivera, Ido Kaminer, Bo Zhen, Marin Soljacic, John Joannopoulos
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Patent number: 9677741Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: GrantFiled: April 4, 2016Date of Patent: June 13, 2017Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Patent number: 9458989Abstract: Disclosed herein are transparent color displays with nanoparticles made with nonlinear materials and/or designed to exhibit optical resonances. These nanoparticles are embedded in or hosted on a transparent substrate, such as a flexible piece of clear plastic or acrylic. Illuminating the nanoparticles with invisible light (e.g., infrared or ultraviolet light) causes them to emit visible light. For example, a rare-earth doped nanoparticle may emit visible light when illuminated simultaneoulsy with a first infrared beam at a first wavelength ?1 and a second infrared beam at a second wavelength ?2. And a frequency-doubling nanoparticle may emit visible light when illuminated with a single infrared beam at the nanoparticle's resonant frequency. Selectively addressing these nanoparticles with appropiately selected pump beams yields visible light emitted from the nanoparticles hosted by the transparent substrate in a desired pattern.Type: GrantFiled: December 30, 2013Date of Patent: October 4, 2016Assignee: Massachusetts Institute of TechnologyInventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Publication number: 20160216600Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: ApplicationFiled: April 4, 2016Publication date: July 28, 2016Inventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Patent number: 9335027Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: GrantFiled: October 30, 2013Date of Patent: May 10, 2016Assignee: Massachusetts Institute of TechnologyInventors: Chia Wei Hsu, Wenjun Qiu, Bo Zhen, Ofer Shapira, Marin Soljacic
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Publication number: 20150128429Abstract: The disclosure relates to a transmission for a power tool, comprising an input gear driven by a driver, an intermediate shaft carrying first and second intermediate gears, the first intermediate gear being meshed with the input gear, an output shaft carrying an output gear, the output gear being meshed with the second intermediate gear for driving a tool bit, and proximal and distal bearings supporting proximal and distal ends of the intermediate shaft respectively. The first intermediate gear is formed with a receptacle portion which is recessed from a proximal end surface of the first intermediate gear in an axial direction towards a distal side, the proximal bearing being received in the receptacle portion at least in part in the axial direction. The disclosure also relates to a power tool comprising the above transmission. The disclosure provides a compact and robust structure.Type: ApplicationFiled: February 27, 2013Publication date: May 14, 2015Inventors: Youmei Yan, Bo Zhen, Aigui Wang
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Patent number: 8969831Abstract: Disclosed herein is a system for stimulating emission from at least one an emitter, such as a quantum dot or organic molecule, on the surface of a photonic crystal comprising a patterned dielectric substrate. Embodiments of this system include a laser or other source that illuminates the emitter and the photonic crystal, which is characterized by an energy band structure exhibiting a Fano resonance, from a first angle so as to stimulate the emission from the emitter at a second angle. The coupling between the photonic crystal and the emitter may result in spectral and angular enhancement of the emission through excitation and extraction enhancement. These enhancement mechanisms also reduce the emitter's lasing threshold. For instance, these enhancement mechanisms enable lasing of a 100 nm thick layer of diluted organic molecules solution with reduced threshold intensity. This reduction in lasing threshold enables more efficient organic light emitting devices and more sensitive molecular sensing.Type: GrantFiled: February 15, 2013Date of Patent: March 3, 2015Assignee: Massachusetts Institute of TechnologyInventors: Ofer Shapira, Marin Soljacic, Bo Zhen, Song-Liang Chua, Jeongwon Lee, John Joannopoulos
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Patent number: 8837550Abstract: An organic dye laser produces a continuous-wave (cw) output without any moving parts (e.g., without using flowing dye streams or spinning discs of solid-state dye media to prevent photobleaching) and with a pump beam that is stationary with respect to the organic dye medium. The laser's resonant cavity, organic dye medium, and pump beam are configured to excite a lasing transition over a time scale longer than the associated decay lifetimes in the organic dye medium without photobleaching the organic dye medium. Because the organic dye medium does not photobleach when operating in this manner, it may be pumped continuously so as to emit a cw output beam. In some examples, operation in this manner lowers the lasing threshold (e.g., to only a few Watts per square centimeter), thereby facilitating electrical pumping for cw operation.Type: GrantFiled: March 6, 2013Date of Patent: September 16, 2014Assignee: Massachusetts Institute of TechnologyInventors: Ofer Shapira, Song-Liang Chua, Bo Zhen, Jeongwon Lee, Marin Soljacic
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Publication number: 20140185284Abstract: Disclosed herein are transparent color displays with nanoparticles made with nonlinear materials and/or designed to exhibit optical resonances. These nanoparticles are embedded in or hosted on a transparent substrate, such as a flexible piece of clear plastic or acrylic. Illuminating the nanoparticles with invisible light (e.g., infrared or ultraviolet light) causes them to emit visible light. For example, a rare-earth doped nanoparticle may emit visible light when illuminated simultaneoulsy with a first infrared beam at a first wavelength ?1 and a second infrared beam at a second wavelength ?2. And a frequency-doubling nanoparticle may emit visible light when illuminated with a single infrared beam at the nanoparticle's resonant frequency. Selectively addressing these nanoparticles with appropiately selected pump beams yields visible light emitted from the nanoparticles hosted by the transparent substrate in a desired pattern.Type: ApplicationFiled: December 30, 2013Publication date: July 3, 2014Inventors: CHIA WEI HSU, WENJUN QIU, BO ZHEN, OFER SHAPIRA, MARIN SOLJACIC
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Publication number: 20140185282Abstract: Transparent displays enable many useful applications, including heads-up displays for cars and aircraft as well as displays on eyeglasses and glass windows. Unfortunately, transparent displays made of organic light-emitting diodes are typically expensive and opaque. Heads-up displays often require fixed light sources and have limited viewing angles. And transparent displays that use frequency conversion are typically energy inefficient. Conversely, the present transparent displays operate by scattering visible light from resonant nanoparticles with narrowband scattering cross sections and small absorption cross sections. More specifically, projecting an image onto a transparent screen doped with nanoparticles that selectively scatter light at the image wavelength(s) yields an image on the screen visible to an observer. Because the nanoparticles scatter light at only certain wavelengths, the screen is practically transparent under ambient light.Type: ApplicationFiled: October 30, 2013Publication date: July 3, 2014Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: CHIA WEI HSU, WENJUN QIU, BO ZHEN, OFER SHAPIRA, MARIN SOLJACIC
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Publication number: 20140126602Abstract: An organic dye laser produces a continuous-wave (cw) output without any moving parts (e.g., without using flowing dye streams or spinning discs of solid-state dye media to prevent photobleaching) and with a pump beam that is stationary with respect to the organic dye medium. The laser's resonant cavity, organic dye medium, and pump beam are configured to excite a lasing transition over a time scale longer than the associated decay lifetimes in the organic dye medium without photobleaching the organic dye medium. Because the organic dye medium does not photobleach when operating in this manner, it may be pumped continuously so as to emit a cw output beam. In some examples, operation in this manner lowers the lasing threshold (e.g., to only a few Watts per square centimeter), thereby facilitating electrical pumping for cw operation.Type: ApplicationFiled: March 6, 2013Publication date: May 8, 2014Inventors: Ofer Shapira, Song-Liang Chua, Bo Zhen, Jeongwon Lee, Marin Soljacic
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Publication number: 20130292148Abstract: A portable power tool includes a motor housing and a motor mounted in the motor housing. The motor includes a rotary spindle. The portable power tool also includes a trigger configured to be actuated and released to switch on and off the motor. The portable power tool also includes a mechanical brake assembly connected with the trigger and automatically operated by the trigger. Accordingly, the brake assembly releases the spindle when the trigger is activated and brakes the spindle when the trigger is released.Type: ApplicationFiled: August 11, 2010Publication date: November 7, 2013Applicant: Bosch Power Tools (China) Co., Ltd.Inventors: Bo Zhen, Aigui Wang, Songtao Jin