Prof. Qihuang Gong Profile

Prof. Qihuang Gong

Vice President at Peking Univ

SPIE Involvement:

Publications (29)

PROCEEDINGS ARTICLE | April 21, 2017

Optical microcavity sensing: from reactive to dissipative interactions (Conference Presentation)

Proc. SPIE. 10090, Laser Resonators, Microresonators, and Beam Control XIX

KEYWORDS: Gold, Environmental monitoring, Homeland security, Optical sensing, Nanoparticles, Particles, Environmental sensing, Light-matter interactions, Optical microcavities, Polarizability

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PROCEEDINGS ARTICLE | February 17, 2017

Femtosecond laser nano/microfabrication via three-dimensional focal field engineering

Proc. SPIE. 10092, Laser-based Micro- and Nanoprocessing XI

KEYWORDS: Superposition, Femtosecond phenomena, Gaussian beams, Two photon polymerization, Phase modulation, Waveguides, Cladding, Polymers, Glasses, Laser processing, Phase shift keying, Laser beam propagation, Spatial light modulators, Microfabrication, Nanofabrication, 3D microstructuring

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SPIE Conference Volume | January 11, 2017

Quantum and Nonlinear Optics IV

PROCEEDINGS ARTICLE | January 11, 2017

Luminescence quantum yields of gold nanoparticles varying with excitation wavelength

Proc. SPIE. 10027, Nanophotonics and Micro/Nano Optics III

KEYWORDS: Gold, Plasmonics, Plasmons, Nanostructures, Scattering, Nanoparticles, Luminescence, Laser scattering, Absorption, Nanorods

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PROCEEDINGS ARTICLE | December 22, 2015

Plasmonic nano-resonator enhanced one-photon luminescence from single gold nanorods

Proc. SPIE. 9668, Micro+Nano Materials, Devices, and Systems

KEYWORDS: Gold, Plasmonics, Polarization, Scattering, Luminescence, Electrons, Quantum efficiency, Light scattering, Laser scattering, Nanorods

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PROCEEDINGS ARTICLE | March 16, 2015

Polarization-dependent photocurrent in MoS2 phototransistor

Proc. SPIE. 9357, Physics and Simulation of Optoelectronic Devices XXIII

KEYWORDS: Gold, Plasmonics, Nanostructures, Surface plasmons, Polarization, Field effect transistors, Molybdenum, Phototransistors, Resonance enhancement, Absorption

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SPIE Conference Volume | December 4, 2014

Quantum and Nonlinear Optics III

PROCEEDINGS ARTICLE | September 17, 2014

Study of solvation dynamics in the interior of staphylococcal nuclease (SNase) using picosecond-resolved emission spectra of tryptophan

Proc. SPIE. 9230, Twelfth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2014)

KEYWORDS: Ultrafast phenomena, Proteins, Luminescence, Molecules, Crystals, Quantum efficiency, Molecular biology, Picosecond phenomena, Bioinformatics, Correlation function

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PROCEEDINGS ARTICLE | September 13, 2013

Low-threshold Raman laser from an on-chip, high Q polymer microcavity

Proc. SPIE. 8807, Nanophotonic Materials X

KEYWORDS: Silica, Polymers, Silicon, Coating, Semiconductor lasers, Raman spectroscopy, Thermal effects, Laser damage threshold, Optical microcavities, Absorption

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PROCEEDINGS ARTICLE | March 12, 2013

On-chip ultrahigh-Q microcavities for highly unidirectional emission

Proc. SPIE. 8600, Laser Resonators, Microresonators, and Beam Control XV

KEYWORDS: Silica, Etching, Dry etching, Silicon, Laser processing, Doping, Refraction, Erbium, Optical pumping, Optical microcavities

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SPIE Conference Volume | December 18, 2012

Quantum and Nonlinear Optics II

PROCEEDINGS ARTICLE | November 20, 2012

Fano resonance in whispering gallery photonic microcavities

Proc. SPIE. 8564, Nanophotonics and Micro/Nano Optics

KEYWORDS: Biosensing, Transparency, Resonators, Silica, Waveguides, Polarization, Solids, Fiber couplers, Optical microcavities, Photonic microstructures

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PROCEEDINGS ARTICLE | May 17, 2011

High-sensitivity temperature sensing by employing an on-chip high-Q PDMS-coated toroidal microcavity

Proc. SPIE. 8034, Photonic Microdevices/Microstructures for Sensing III

KEYWORDS: Infrared sensors, Microresonators, Silica, Sensors, Coating, Temperature sensors, Thermal effects, Optical resolution, Optical microcavities, Temperature metrology

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PROCEEDINGS ARTICLE | November 16, 2010

An electron transporting blue emitter for OLED

Proc. SPIE. 7852, LED and Display Technologies

KEYWORDS: Organic light emitting diodes, Luminescence, Electroluminescence, Organic materials, LCDs, Flat panel displays, Plasma display panels, Electron transport, Flexible displays, Absorption

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PROCEEDINGS ARTICLE | November 16, 2010

n-Type doping in organic electronic devices

Proc. SPIE. 7852, LED and Display Technologies

KEYWORDS: Organic photovoltaics, Electrodes, Organic light emitting diodes, Metals, Interfaces, Doping, Laser induced fluorescence, Aluminum, Electron transport, Organic electronics

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A facile way to fabricate highly efficient organic light emitting devices (OLEDs) with insulator MnO as an electron injecting and transporting material was devised, which eliminates the problem of the oxidation of reactive dopants. The power efficiency of 1.1 lm/W by inserting 3-nm-thick MnO as the electron injecting layer was obtained, higher than the 0.8 lm/W efficiency for the reference device with 0.5-nm-thick LiF. A thermal co-evaporation layer containing 10% weight of MnO and tris(8-hydroxyquinolato)aluminum (Alq₃) as the electron transporting layer showed more efficient electron transport ability, with turn-on voltage of 3.8 V, lower than 7.4 V for the intrinsic Alq₃. Meanwhile, the insertion of thin MnO layer between organic photoactive layer and inorganic metal electrode significantly improved performance and stability of organic solar cell compared to device without it. The power conversion efficiency (PCE) of 2.91% by inserting 3-nm-thick MnO was obtained, higher than the 0.91% efficiency for the device without it, and 2.59% for the device with 0.5-nm-thick LiF. Charge transport of rhenium trioxide (ReO₃) in organic electronic devices was investigated. The hole injection/transport was blocked and the electron injection/transport was enhanced with doping of ReO₃ in organic electronic devices. Thus the charge balance and efficiency of the OLED were improved, 2.7 cd/A of current efficiency (CE) at 20 mA/cm² for the device with ReO₃ was higher than 1.5 cd/A for the device without it. In the case of organic photovoltaic cells (OPV), the open-circuit voltage (V_oc), 0.58 V, was higher compared to the device without ReO₃ (0.44 V) due to the improvement of interface properties. The PCE was increased to 2.27% by the combination of ReO₃ (increasing V_oc) with poly(3,4-ethylene dioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) (improve hole transport to increase J_sc) on the modification of the anode, higher than 1.85% for the device without ReO₃.

SPIE Conference Volume | November 4, 2010

Quantum and Nonlinear Optics

PROCEEDINGS ARTICLE | February 1, 2008

Femtosecond laser micromachining and microfabrication in transparent materials

Proc. SPIE. 6825, Lasers in Material Processing and Manufacturing III

KEYWORDS: Femtosecond phenomena, Silica, Waveguides, Water, Glasses, Laser drilling, Laser ablation, Computer generated holography, Laser cutting, Absorption

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SPIE Conference Volume | January 4, 2008

Nonlinear Optics: Technologies and Applications

PROCEEDINGS ARTICLE | November 20, 2007

A stable red emission in polymer light-emitting diodes based on phenothiazine derivative

Proc. SPIE. 6828, Light-Emitting Diode Materials and Devices II

KEYWORDS: Light emitting diodes, Electrodes, Organic light emitting diodes, Polymers, Glasses, Annealing, Luminescence, Nitrogen, Electroluminescence, Absorption

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PROCEEDINGS ARTICLE | January 28, 2005

Fabrication of high refractive index-modulation structures in fused silica by femtosecond laser pulses

Proc. SPIE. 5646, Nonlinear Optical Phenomena and Applications

KEYWORDS: Microscopes, Diffraction, Refractive index, Femtosecond phenomena, Modulation, Silica, Laser damage threshold, Zone plates, Pulsed laser operation, Diffraction gratings

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PROCEEDINGS ARTICLE | January 28, 2005

Shift multiplexing in a compact holographic storage system by using planar waveguide referencing

Proc. SPIE. 5646, Nonlinear Optical Phenomena and Applications

KEYWORDS: Diffraction, Mirrors, Holograms, Holography, Waveguides, Crystals, Multiplexing, Planar waveguides, Laser crystals, Volume holography

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SPIE Conference Volume | January 28, 2005

Nonlinear Optical Phenomena and Applications

PROCEEDINGS ARTICLE | January 28, 2005

Full functional photorefractive molecule with large two-beam coupling gain

Proc. SPIE. 5646, Nonlinear Optical Phenomena and Applications

KEYWORDS: Diffraction, Refractive index, Modulation, Molecules, Crystals, Chromophores, Electro optics, Signal detection, Polarizability, Absorption

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PROCEEDINGS ARTICLE | January 28, 2005

Interaction between subpicosecond laser and fused silica

Proc. SPIE. 5646, Nonlinear Optical Phenomena and Applications

KEYWORDS: Beam splitters, Silica, Interferometry, Numerical simulations, Ionization, Laser damage threshold, Laser beam diagnostics, Pulsed laser operation, Plasma, Absorption

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PROCEEDINGS ARTICLE | May 19, 2000

Index gratings in low glass transition temperature polymer composites based on poly(N-vinylcarbazole)

Proc. SPIE. 3939, Organic Photonic Materials and Devices II

KEYWORDS: Diffraction, Refractive index, Polymers, Glasses, Composites, Photorefraction, Four wave mixing, Polymer thin films, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | August 17, 1998

Poly(N-vinylcarbazole)-based low glass transition temperature three-component photorefractive composites

Proc. SPIE. 3554, Photorefractive Materials: Phenomena and Related Applications II

KEYWORDS: Diffraction, Birefringence, Polymers, Glasses, Molecules, Composites, Chromophores, Nonlinear optics, Electro optics, Diffraction gratings

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Three-component is a promising direction to overcome disadvantages (e.g., unstability and critical environment requirement) of the four-component low glass transition temperature photorefractive (PR) polymer composite which consists of photosensitizer, nonlinear optical (NLO) chromophore, charge transport agent, and the plasticizer separately. Based on the well-known hole photoconductive network of poly(N-vinylcarbazole):2,4,7-trinitro-9-fluorenone, in our presented investigations, several well-performanced three-component PR composites were developed for different application purposes with the optimal designing optical chromophore exhibit both NLO response and plasticizing property. Generally, it is expected that long chain alkoxy of the chromophore may increase the plasticizing property while long alkoxy chain makes itself more easy to curl, which might weaken the plasticizing function, thus an optimum selection ofthe length ofthe alkoxy exists. From the experimental observations of 2,5-dimethyl-4-(4'—nitrophenylazo)benzene with different length of the alkoxy, it was indicated that high coupling gain (—195 cm') and index grating amplitude (—.4.3x1O) were achieved at 633nm in the composite contain l-n-butoxyl-2,5-dimethyl-4-(4'_nitrophenylazo)benzene. Besides, different substituent groups make the chromophore inequal plasticizing and different electrooptic properties. For operating at short wavelength, 3,3-diacety1-4methoxylstyrene is the more suitable selection (with a coupling gain of—38cm' at 543 urn, which is higher than these at 593 nm, 612nm and 633 urn). Doped with f3,f-diacety1-4-methoxylstyrene, a response time as short as —17 ms at illumination intensity of 1 W/cm2 at the wavelength of 633 nm was estimated, which is the most fast response reported up to now and can be used in real-time optical information processing. On the other hand, all composites mentioned above have long lifetime and high stability

Key words: phtorefractive, polymer, three-component, grass transition temperature, coupling gain, real-time hologram

PROCEEDINGS ARTICLE | August 17, 1998

Multigrating in photorefractive composites containing nonlinear chromophore azo-dye 1-n-butoxyl-2,5-dimethyl-4-(4'-nitrophenylazo)benzene

Proc. SPIE. 3554, Photorefractive Materials: Phenomena and Related Applications II

KEYWORDS: Diffraction, Refractive index, Polymers, Composites, Fourier transforms, Physics, Chromophores, Mesoscopic physics, Diffraction gratings, Absorption

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PROCEEDINGS ARTICLE | May 22, 1998

Gratings in doped photorefractive composite containing 1-n-butoxyl-2,5-dimethyl-4-(4'-nitrophenylazo)benzene

Proc. SPIE. 3490, Optics in Computing '98

KEYWORDS: Holograms, Polymers, Crystals, Composites, Diffusion, Quantum efficiency, Signal processing, Photorefraction, Electro optics, Electro optical modeling

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