han xiuyou - Academia.edu (original) (raw)

Papers by han xiuyou

Recent progress in research on polymer photonics is reviewed in this paper, including new concept... more Recent progress in research on polymer photonics is reviewed in this paper, including new concepts of polymer-based photonic materials, components and devices. Novel polymer photonic materials developed in our photonic research group, polysiloxanes (named as PSQ-Ls), are reported, including two kinds of PSQ-Ls, named as PSQ-LL and PSQ-LH. These polymer photonic materials are of a liquid and can be cured by UV light irradiation or by heat. The characterization of the optical films and waveguides based on the novel polymer materials, including refractive index, birefringence, optical loss and thermal stability, is given in detail. By blending PSQ-LL and PSQ-LH, the refractive indexes can be tuned linearly from 1.4482 to 1.5212 at 1310nm and from 1.4478 to 1.5198 at 1550nm. The birefringence is below 0.0005 with the variation of PSQ-LL content. These materials exhibit low optical losses of 0.31dB/cm at a wavelength of 1310nm and 0.70dB/cm at 1550nm, and high thermal stability with 1% decomposition temperatures of 297°C (in air) and 340°C (in N2) for PSQ-LH, and 313°C (in air) and 370°C (in N2) for PSQ-LL. Optical waveguide components such as micro-ring resonators and waveguide gratings based on PSQ-Ls are fabricated by photolithography-etching method and by UV imprint technology, respectively. The experimental measurements show that the polymer-based micro-ring resonators exhibit an excellent resonant filtering function. Potential applications of the polymer-based micro-ring resonators for optical communications and optical sensing are discussed.

IEEE Photonics Journal, 2012

Planar integrated optical biosensors are becoming more and more important as they facilitate labe... more Planar integrated optical biosensors are becoming more and more important as they facilitate label-free and real-time monitoring with high sensitivity. In this paper, the systematic work on the development of this kind of optical biosensor built on a novel polymer platform named PSQ-Ls will be presented. The material itself is of very low cost, and the optical devices with high performances are fabricated through a simple UV-based soft imprint lithography technique. Especially for ring resonator, Q value as high as 5 × 104 and 2.7 × 104 are achieved in air and water condition. These optical chips are functionalized efficiently with protein A molecules through physical immobilization, after careful investigation of the physicochemical and chemical properties of their surface. Both bulk sensing and surface sensing are performed. The proposed optical biosensor exhibits good response not only to its surrounding environment's change but also to the small amount of targeted molecules appearing in the buffered solution, which is human-IgG in our study.

Science China-technological Sciences, 2009

A theoretical model of the erbium-doped waveguide ring laser is established according to the theo... more A theoretical model of the erbium-doped waveguide ring laser is established according to the theory of erbium-doped waveguide amplifier and the transmission matrix of waveguide directional coupler. The influence of bend radius, coupling coefficient and doped erbium ion concentration on the characteristics of waveguide ring laser is investigated. It is shown that due to the co-action of waveguide bend loss and other relevant loss there is an optimal bend radius which can provide simultaneously low threshold pumping power and high laser light output power. As one part of the resonator’s loss, the laser light coupling coefficient of directional coupler has an impact on the laser property. The analysis indicates that the laser achieves the high output power when the coupling coefficient is about 0.2. The threshold pumping power is the minimum when the doped erbium ion concentration is 0.85×1026 m−3. Increasing the concentration of doped erbium ions will enhance the output power of laser light as long as the concentration doesn’t introduce remarkable up-conversion effect. The results give a good theoretical basis for the design and fabrication of erbium-doped waveguide ring laser devices.

Journal of Sol-gel Science and Technology, 2010

Colorless and transparent polysilisiquioxane was synthesized using non-hydrolytic sol–gel process... more Colorless and transparent polysilisiquioxane was synthesized using non-hydrolytic sol–gel process. A high degree of poly-condensation and a lower remnant ratio of Si–OCH3 were calculated by 29Si NMR and 1H NMR, respectively. After spin-coating, subsequently UV and thermal curing, free-cracked thin films were obtained. The properties of the free-cracked thin films were measured by a prism coupler and thermal analysis system. The refractive index increased to 1.5495 (1,310 nm TE) and 1.5468 (1,550 nm TE), respectively, with the increasing of phenyltrimethoxysilane content to 20 mol%. Birefringence was below 0.0005. The thermo-optic coefficient was about −2.8 × 10−4 °C−1. The optical loss was 0.20 dB cm−1 at 1,310 nm and 0.75 dB cm−1 at 1,550 nm, which was very important for core layer material of optical waveguide. The results of Thermo-Gravimetric Analysis indicated an excellent thermal stability. All of these properties imply that it will be a promising core layer material of optical waveguide.

The frequency selectivity of integrated optical ring resonators makes them key components for man... more The frequency selectivity of integrated optical ring resonators makes them key components for many devices, including filters, switches and sensors. The ion-exchange technique is an economical and simple method to fabricate good quality optical waveguides and useful devices. In this paper, with the mixed melt salt of AgNO 3 and KNO 3 used as the source of exchanging ions, a racetrack waveguide resonator was fabricated in K9 glass. The reflection and transmission spectra of the resonator were measured, and the coupling ratio and propagation loss were derived by an improved method. The phase shift of 2π was realized by using thermo-optical effect within 16 degree change of temperature. The resonator is a promising device for filtering, sensing and other applications.

Planar integrated optical biosensors are becoming more and more important as they facilitate labe... more Planar integrated optical biosensors are becoming more and more important as they facilitate label-free and real time monitoring biosensing with high sensitivity. In this paper, the systematic research on one kind of optical biosensor, based on a resonant principle in a polymer ring resonator, will be presented. Reduced footprint and high sensitivity are advantages of this kind of biosensor. Rather than expensive CMOS fabrication, the device with high performance is fabricated through a simple UV based soft imprint technique utilizing self-developed low loss polymer material. The measurement results for the bulk sensing of a NaCl solution and the surface sensing of a minimal amount of avidin molecules in a buffered solution will be presented.

Polymer, 2010

The birefringences, optical losses, refractive indices and their temperature dependency over a ra... more The birefringences, optical losses, refractive indices and their temperature dependency over a range of 30e90 C for the films of carboxyl-containing polyaryletherketones with systematically varied alkyl substituents were investigated in detail. The results showed that the optical losses at 1310 nm were mainly affected by the content of CeH bond, whereas that at 1550 nm were more related to the presence of OeH bond. Moreover, two methyls and two bulky isopropyls on the phenylene rings led to the distorted polymer chain, which significantly reduced the chain packing density and disturbed the alignment of polymer chains along the substrate surface, and consequently resulted into the polymer films low refractive indices and birefringences. Furthermore, after conversion of carboxylic group to acyl chloride group, using rigid rod-like hydroquione and twisted phenolphthalein as bisphenol crosslinkers, respectively, the transparent smooth polymer films with three-dimensional network structures were readily obtained at the curing temperature below 200 C without needing any additional catalyst. The cured polymers exhibited excellent resistance to organic solvents and good thermal stability as well as low birefringence of 0.0019 and greatly decreased optical loss at 1550 nm by about 78%.

Microwave and Optical Technology Letters, 2010

This article presents a vector signal transmission architecture for wireless network based on rad... more This article presents a vector signal transmission architecture for wireless network based on radio-over-fiber system. Partly double sideband carrier suppressed modulation scheme was used to generate optical frequency doubled microwave while the same optical carrier was reused via a fiber grating for up-link transmission in base station (BS). The 5 GHz microwave carrying 1 Mbps 8PSK-vector signal was up-converted to 10 GHz in BS with the vector signal conversion from 8PSK to QPSK. Also, a 50 GHz millimeter-wave was generated that can be seen from the optical spectra. Such a system shows simple configuration and is cost-efficient. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1145–1148, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25103

Microwave and Optical Technology Letters, 2010

A distinction exists between negative phase velocity and negative refraction for linear isotropic... more A distinction exists between negative phase velocity and negative refraction for linear isotropic dielectric-magnetic materials, active or passive.

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.

Recent progress in research on polymer photonics is reviewed in this paper, including new concept... more Recent progress in research on polymer photonics is reviewed in this paper, including new concepts of polymer-based photonic materials, components and devices. Novel polymer photonic materials developed in our photonic research group, polysiloxanes (named as PSQ-Ls), are reported, including two kinds of PSQ-Ls, named as PSQ-LL and PSQ-LH. These polymer photonic materials are of a liquid and can be cured by UV light irradiation or by heat. The characterization of the optical films and waveguides based on the novel polymer materials, including refractive index, birefringence, optical loss and thermal stability, is given in detail. By blending PSQ-LL and PSQ-LH, the refractive indexes can be tuned linearly from 1.4482 to 1.5212 at 1310nm and from 1.4478 to 1.5198 at 1550nm. The birefringence is below 0.0005 with the variation of PSQ-LL content. These materials exhibit low optical losses of 0.31dB/cm at a wavelength of 1310nm and 0.70dB/cm at 1550nm, and high thermal stability with 1% decomposition temperatures of 297°C (in air) and 340°C (in N2) for PSQ-LH, and 313°C (in air) and 370°C (in N2) for PSQ-LL. Optical waveguide components such as micro-ring resonators and waveguide gratings based on PSQ-Ls are fabricated by photolithography-etching method and by UV imprint technology, respectively. The experimental measurements show that the polymer-based micro-ring resonators exhibit an excellent resonant filtering function. Potential applications of the polymer-based micro-ring resonators for optical communications and optical sensing are discussed.

IEEE Photonics Journal, 2012

Planar integrated optical biosensors are becoming more and more important as they facilitate labe... more Planar integrated optical biosensors are becoming more and more important as they facilitate label-free and real-time monitoring with high sensitivity. In this paper, the systematic work on the development of this kind of optical biosensor built on a novel polymer platform named PSQ-Ls will be presented. The material itself is of very low cost, and the optical devices with high performances are fabricated through a simple UV-based soft imprint lithography technique. Especially for ring resonator, Q value as high as 5 × 104 and 2.7 × 104 are achieved in air and water condition. These optical chips are functionalized efficiently with protein A molecules through physical immobilization, after careful investigation of the physicochemical and chemical properties of their surface. Both bulk sensing and surface sensing are performed. The proposed optical biosensor exhibits good response not only to its surrounding environment's change but also to the small amount of targeted molecules appearing in the buffered solution, which is human-IgG in our study.

Science China-technological Sciences, 2009

A theoretical model of the erbium-doped waveguide ring laser is established according to the theo... more A theoretical model of the erbium-doped waveguide ring laser is established according to the theory of erbium-doped waveguide amplifier and the transmission matrix of waveguide directional coupler. The influence of bend radius, coupling coefficient and doped erbium ion concentration on the characteristics of waveguide ring laser is investigated. It is shown that due to the co-action of waveguide bend loss and other relevant loss there is an optimal bend radius which can provide simultaneously low threshold pumping power and high laser light output power. As one part of the resonator’s loss, the laser light coupling coefficient of directional coupler has an impact on the laser property. The analysis indicates that the laser achieves the high output power when the coupling coefficient is about 0.2. The threshold pumping power is the minimum when the doped erbium ion concentration is 0.85×1026 m−3. Increasing the concentration of doped erbium ions will enhance the output power of laser light as long as the concentration doesn’t introduce remarkable up-conversion effect. The results give a good theoretical basis for the design and fabrication of erbium-doped waveguide ring laser devices.

Journal of Sol-gel Science and Technology, 2010

Colorless and transparent polysilisiquioxane was synthesized using non-hydrolytic sol–gel process... more Colorless and transparent polysilisiquioxane was synthesized using non-hydrolytic sol–gel process. A high degree of poly-condensation and a lower remnant ratio of Si–OCH3 were calculated by 29Si NMR and 1H NMR, respectively. After spin-coating, subsequently UV and thermal curing, free-cracked thin films were obtained. The properties of the free-cracked thin films were measured by a prism coupler and thermal analysis system. The refractive index increased to 1.5495 (1,310 nm TE) and 1.5468 (1,550 nm TE), respectively, with the increasing of phenyltrimethoxysilane content to 20 mol%. Birefringence was below 0.0005. The thermo-optic coefficient was about −2.8 × 10−4 °C−1. The optical loss was 0.20 dB cm−1 at 1,310 nm and 0.75 dB cm−1 at 1,550 nm, which was very important for core layer material of optical waveguide. The results of Thermo-Gravimetric Analysis indicated an excellent thermal stability. All of these properties imply that it will be a promising core layer material of optical waveguide.

The frequency selectivity of integrated optical ring resonators makes them key components for man... more The frequency selectivity of integrated optical ring resonators makes them key components for many devices, including filters, switches and sensors. The ion-exchange technique is an economical and simple method to fabricate good quality optical waveguides and useful devices. In this paper, with the mixed melt salt of AgNO 3 and KNO 3 used as the source of exchanging ions, a racetrack waveguide resonator was fabricated in K9 glass. The reflection and transmission spectra of the resonator were measured, and the coupling ratio and propagation loss were derived by an improved method. The phase shift of 2π was realized by using thermo-optical effect within 16 degree change of temperature. The resonator is a promising device for filtering, sensing and other applications.

Planar integrated optical biosensors are becoming more and more important as they facilitate labe... more Planar integrated optical biosensors are becoming more and more important as they facilitate label-free and real time monitoring biosensing with high sensitivity. In this paper, the systematic research on one kind of optical biosensor, based on a resonant principle in a polymer ring resonator, will be presented. Reduced footprint and high sensitivity are advantages of this kind of biosensor. Rather than expensive CMOS fabrication, the device with high performance is fabricated through a simple UV based soft imprint technique utilizing self-developed low loss polymer material. The measurement results for the bulk sensing of a NaCl solution and the surface sensing of a minimal amount of avidin molecules in a buffered solution will be presented.

Polymer, 2010

The birefringences, optical losses, refractive indices and their temperature dependency over a ra... more The birefringences, optical losses, refractive indices and their temperature dependency over a range of 30e90 C for the films of carboxyl-containing polyaryletherketones with systematically varied alkyl substituents were investigated in detail. The results showed that the optical losses at 1310 nm were mainly affected by the content of CeH bond, whereas that at 1550 nm were more related to the presence of OeH bond. Moreover, two methyls and two bulky isopropyls on the phenylene rings led to the distorted polymer chain, which significantly reduced the chain packing density and disturbed the alignment of polymer chains along the substrate surface, and consequently resulted into the polymer films low refractive indices and birefringences. Furthermore, after conversion of carboxylic group to acyl chloride group, using rigid rod-like hydroquione and twisted phenolphthalein as bisphenol crosslinkers, respectively, the transparent smooth polymer films with three-dimensional network structures were readily obtained at the curing temperature below 200 C without needing any additional catalyst. The cured polymers exhibited excellent resistance to organic solvents and good thermal stability as well as low birefringence of 0.0019 and greatly decreased optical loss at 1550 nm by about 78%.

Microwave and Optical Technology Letters, 2010

This article presents a vector signal transmission architecture for wireless network based on rad... more This article presents a vector signal transmission architecture for wireless network based on radio-over-fiber system. Partly double sideband carrier suppressed modulation scheme was used to generate optical frequency doubled microwave while the same optical carrier was reused via a fiber grating for up-link transmission in base station (BS). The 5 GHz microwave carrying 1 Mbps 8PSK-vector signal was up-converted to 10 GHz in BS with the vector signal conversion from 8PSK to QPSK. Also, a 50 GHz millimeter-wave was generated that can be seen from the optical spectra. Such a system shows simple configuration and is cost-efficient. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1145–1148, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25103

Microwave and Optical Technology Letters, 2010

A distinction exists between negative phase velocity and negative refraction for linear isotropic... more A distinction exists between negative phase velocity and negative refraction for linear isotropic dielectric-magnetic materials, active or passive.

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.