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2018
Volume: 14 Issue 3
18 Article(s)
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Biological reaction signal enhancement in porous silicon Bragg mirror based on quantum dots fluorescence
Yan-yu LI, Zhen-hong JIA, Jia-jia WANG, and Chang-wu and LV
In this paper, we mainly study the preparation of an optical biosensor based on porous silicon (PSi) Bragg mirror and its feasibility for biological detection. The quantum dot (QD) labeled biotin was pipetted onto streptavidin functionalized PSi Bragg mirror samples, the affinity reaction between QD labeled biotin and In this paper, we mainly study the preparation of an optical biosensor based on porous silicon (PSi) Bragg mirror and its feasibility for biological detection. The quantum dot (QD) labeled biotin was pipetted onto streptavidin functionalized PSi Bragg mirror samples, the affinity reaction between QD labeled biotin and streptavidin in PSi occurred, so the QDs were indirectly connected to the PSi. The fluorescence of QD enhanced the signal of biological reactions in PSi. The performance of the sensor is verified by detecting the fluorescence of the QD in PSi. Due to the fluorescence intensity of the QDs can be enhanced by PSi Bragg mirror, the sensitivity of the PSi optical biosensor will be improved..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 172 (2018)
Effect of Al:Agalloy cathode on the performance of transparent organic light-emitting devices
Jin-hong LIU, and Fang-hui and ZHANG
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 175 (2018)
Time constant optimization ofsolar irradiance absolute radiometer
TANGXiao , Wei FANG, Yu-peng WANG, Dong-jun YANG, and Xiao-long and YI
We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer (SIAR). The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06% in the midday and We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer (SIAR). The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06% in the midday and 0.275% in the morning and afternoon. The uncertainty level which can be considered negligible for SIAR is also investigated, and it is suggested that the uncertainty level has to be less than 0.02%. Then, combining the requirement of international comparison with these two conclusions, we conclude that the suitable time constant for SIAR is 20 s..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 179 (2018)
Magnetic field sensor based on peanut-shape structure and multimode fiber
Ye CAO, Yue ZHAO, Zheng-rong TONG, and Yan and WANG
An all fiber magnetic field sensor with peanut-shape structure based on multimode fiber (MMF) is proposed and experimentally demonstrated. The sensing structure and magnetic fluid (MF) are both encapsulated in capillary, and the effective refractive index of MF is affected by surrounding magnetic field strength. The meAn all fiber magnetic field sensor with peanut-shape structure based on multimode fiber (MMF) is proposed and experimentally demonstrated. The sensing structure and magnetic fluid (MF) are both encapsulated in capillary, and the effective refractive index of MF is affected by surrounding magnetic field strength. The measurement of magnetic field is realized by observing the wavelength drift of interference peak. The transmission spectrum generated by Mach-Zehnder interferometer (MZI) includes core-core mode interference and core-cladding mode interference. Experimental results demonstrate that the core-cladding mode interference is sensitive to magnetic field, and the magnetic field sensitivity is 0.047 8 nm/mT. In addition, two kinds of interference dips are sensitive to temperature, and the sensitivities are 0.060 0 nm/°C and 0.052 6 nm/°C, respectively. So the simultaneous measurement of magnetic field strength and temperature can be achieved based on sensitivity matrix..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 184 (2018)
Generation of picosecond vortexbeam in a self-mode-locked Nd:YVO4 laser
Zuo-han LI, Ji-ying PENG, Qing-ling LI, Yi-Fei GAO, Jian-wei LI, and Qiu-yuan and CAO
In this paper,a self-mode-locked Nd:YVO4 picosecond vortex laser is demonstrated, which can operate on the different Laguerre-Gaussian (LG) modes at 1 064 nm. A π/2 mode converter is utilized to realize the picosecond vortex laser with LG mode transformed from the high-order Hermite-Gaussian (HG) mode. For the proposedIn this paper,a self-mode-locked Nd:YVO4 picosecond vortex laser is demonstrated, which can operate on the different Laguerre-Gaussian (LG) modes at 1 064 nm. A π/2 mode converter is utilized to realize the picosecond vortex laser with LG mode transformed from the high-order Hermite-Gaussian (HG) mode. For the proposed laser, the mode-locked pulse repetition rate is 1.81 GHz. The average output powers of LG12 mode and LG02 mode are 1.241 W and 1.27 W, respectively, and their slope efficiencies are 23.2% and 24%, respectively..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 188 (2018)
Organic light emitting devices employing non-doped structure
YANGHui-shan , Qi-zhen YANG, and Li-shuang and WU
A kind of efficient non-doped white organic light-emitting diodes (WOLEDs) were realized by using a bright blue-emitting layer of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi) combining with red emitting ultrathin layer of ［2-methyl-6-［2-(2,3,6,7-tetrahydro-1H,5H-benzo［ij］quinolizin-9-yl)ethenyl］-4H-pyran-4-ylidene］pA kind of efficient non-doped white organic light-emitting diodes (WOLEDs) were realized by using a bright blue-emitting layer of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi) combining with red emitting ultrathin layer of ［2-methyl-6-［2-(2,3,6,7-tetrahydro-1H,5H-benzo［ij］quinolizin-9-yl)ethenyl］-4H-pyran-4-ylidene］propane-dinitrile (DCM2) and green emitting ultrathin layer of 10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H, 11H(1)-benzopyropyrano(6,7-8-i,j)quinolizin-11-one (C545T) with different thicknesses of 0.05 nm, 0.10 nm and 0.20 nm. For comparing, a doped WOLED was also fabricated, in which C545T and DCM2 are codoped into DPVBi layer to provide blue, green and red emission for obtaining white emission. The maximum luminance and power efficiency of the doped WOLED are 5 765 cd/m2 at 16 V and 5.23 lm/W at 5 V, respectively, and its Commission Internationale de l’Eclairage (CIE) coordinate changes from (0.393 7, 0.445 3) at 5 V to (0.300 7, 0.373 8) at 12 V. When the thickness of the ultrathin C545T layer in non-doped WLEDs increases, the emission luminance increases, but all non-doped devices are in the yellow white region. The device with 0.10-nm-thick C545T has a maximum efficiency of 15.23 cd/A at 8 V and a maximum power efficiency of 6.51 lm/W at 7 V, and its maximum luminance is 10 620 cd/m2 at 16 V. CIE coordinates of non-doped WLEDs with C545T thickness of 0.05 nm, 0.10 nm and 0.20 nm are (0.447 3, 0.455 6), (0.464 0, 0.473 1) and (0.458 4, 0.470 0) at 8 V, respectively..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 192 (2018)
Generation of Airy beams using a phase-only Fresnel holographic lens
Qiang LU, Shi-jie GAO, Ying-xue NI, Jia-bin WU, and Yan-feng and QIAO
A method to generate Airy beam by combining the Fresnel holographic lens and the cubic phase of Airy beam is proposed. The detailed theoretical derivation to express the optical transform principle of the proposed method is presented. And excellent experimental results are demonstrated. It is shown that this approach wA method to generate Airy beam by combining the Fresnel holographic lens and the cubic phase of Airy beam is proposed. The detailed theoretical derivation to express the optical transform principle of the proposed method is presented. And excellent experimental results are demonstrated. It is shown that this approach works well and simplifies the experimental facility effectively, especially reducing the optical system length to half of that of the conventional method. In addition, the proposed method can realize the beam propagation trajectory control of Airy beam and generate Airy beam array..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 197 (2018)
Image and Information Processing
A 3D video visual comfort evaluation method on the consistency of accommodation and convergence
KANBo-chao , Yan ZHAO, and Shi-gang WANG
With the development ofthree-dimensional (3D) technology, visual fatigue problems in 3D video have got more attention. In this paper, we combine the human vision characteristics and depth perception theory, and propose a 3D video visual comfort evaluation method on the consistency of accommodation and convergence, whicWith the development ofthree-dimensional (3D) technology, visual fatigue problems in 3D video have got more attention. In this paper, we combine the human vision characteristics and depth perception theory, and propose a 3D video visual comfort evaluation method on the consistency of accommodation and convergence, which evaluates the visual comfort from the quantitative perspective under different horizontal disparities and viewing distances. The experimental results show that the proposed evaluation method exhibits good consistency with the subjective assessment results..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 233 (2018)
Anovel denoising method for infrared image based on bilateral filtering and non-local means
Feng-lian LIU, Meng-yao SUN, and Wen-na and CAI
This paper presents an image denoising method based on bilateral filtering and non-local means. The non-local region texture or structure of the image has the characteristics of repetition, which can be used to effectively preserve the edge and detail of the image. And compared with classical methods, bilateral filteriThis paper presents an image denoising method based on bilateral filtering and non-local means. The non-local region texture or structure of the image has the characteristics of repetition, which can be used to effectively preserve the edge and detail of the image. And compared with classical methods, bilateral filtering method has a better performance in denosing for the reason that the weight includes the geometric closeness factor and the intensity similarity factor. We combine the geometric closeness factor with the weight of non-local means, and construct a new weight. Experimental results show that the modified algorithm can achieve better performance. And it can protect the image detail and structure information better..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 237 (2018)
Materials
The optical properties of Tm3+ doped Na5Lu9F32 single crystal
Qi-guo SHENG, Hai-ping XIA, Qing-yang TANG, Shi-nan HE, Jian-li ZHANG, and Bao-jiu and CHEN
Tm3+ doped Na5Lu9F32 single crystal with high optical quality was grown by an improved Bridgman method. The Judd-Ofelt intensity parameters Ωt (t=2, 4, 6) were calculated according to the measured absorption spectra and physical-chemical properties of the obtained Na5Lu9F32 single crystal. The stimulated emission crossTm3+ doped Na5Lu9F32 single crystal with high optical quality was grown by an improved Bridgman method. The Judd-Ofelt intensity parameters Ωt (t=2, 4, 6) were calculated according to the measured absorption spectra and physical-chemical properties of the obtained Na5Lu9F32 single crystal. The stimulated emission cross-section of the 3F4→3H6 transition (~1.8 μm) is 0.35×10-20 cm2 for Tm3+ doped Na5Lu9F32 single crystal. The emission spectra under the excitation of 790 nm laser diode (LD) and fluorescence lifetime at 1.8 μm were measured to reveal the fluorescence properties of Tm3+ doped Na5Lu9F32 single crystal. The research results show that the Tm3+ doped Na5Lu9F32 single crystal has larger stimulated emission cross-section compared with other crystals. All these spectral properties suggest that this kind of Tm3+doped Na5Lu9F32 crystal with high physical-chemical stability and high-efficiency emission at 1.8 μm may be used as potential laser materials for optical devices..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 201 (2018)
Nondestructive characterization of the domain structure of periodically poled lithium niobate crystal based on rigorous coupled-wave analysis
Bao-lu TIAN, Huai-xi CHEN, K Choge Dismas, Yi-bin XU, Guang-wei LI, and Wan-guo and LIANG
We report rigorous coupled-wave analysis (RCWA) method to non-destructively characterize the domain structure of periodically poled lithium niobate (PPLN) crystal. The strong light diffraction effect is achieved by applying a proper external voltage. We can observe reversed domain pattern and employ the detected diffraWe report rigorous coupled-wave analysis (RCWA) method to non-destructively characterize the domain structure of periodically poled lithium niobate (PPLN) crystal. The strong light diffraction effect is achieved by applying a proper external voltage. We can observe reversed domain pattern and employ the detected diffraction intensity to optimally fit the result of RCWA based on least square method. Compared with conventional scalar diffraction theory, more accurate domain structure parameters with accuracies of 0.05 ?倕 m and 0.005 for the period and duty cycle are obtained respectively. It is proved that accurate, real-time and nondestructive characterization can be realized via this method..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 206 (2018)
Two-photon polymerization fabrication and Raman spectroscopy research of SU-8 photoresist using the femtosecond laser
Zi-jian CHEN, Ji YAO, Qing-ji XU, and Zhen-hua and WANG
In this work,a two-photon polymerization (2PP) processing device was built using the femtosecond laser, and femtosecond laser direct writing was performed on SU-8 photoresist. Due to the 2PP effect of the photoresist caused by the femtosecond laser, the polymeric line with size less than the focal spot size is obtainedIn this work,a two-photon polymerization (2PP) processing device was built using the femtosecond laser, and femtosecond laser direct writing was performed on SU-8 photoresist. Due to the 2PP effect of the photoresist caused by the femtosecond laser, the polymeric line with size less than the focal spot size is obtained. Based on the Raman spectroscopy characterization of SU-8 polymer before and after 2PP, we research the dynamic process of femtosecond laser induced 2PP. In Raman spectra, some scattering peaks with large intensity variation, such as 1 108 cm-1 and 1 183 cm-1, indicate that the asymmetric stretching vibration of C-O-C bond in SU-8 polymer is increased. By comparison, we can find that 2PP only affects the light absorption of initiator, but does not affect the monomer polymerization. It is helpful to understand the interaction of photoresist and femtosecond laser, and plays an important role in quantitatively controlling the polymerization degree of SU-8 polymer and improving the processing resolution of 2PP..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 210 (2018)
Structure and photoluminescence properties of InN films grown on porous silicon by MOCVD
Jun WANG, and Hong-yan and ZHANG
In this work,indium nitride (InN) films were successfully grown on porous silicon (PS) using metal oxide chemical vapor deposition (MOCVD) method. Room temperature photoluminescence (PL) and field emission scanning electron microscopy (FESEM) analyses are performed to investigate the optical, structural and morphologicIn this work,indium nitride (InN) films were successfully grown on porous silicon (PS) using metal oxide chemical vapor deposition (MOCVD) method. Room temperature photoluminescence (PL) and field emission scanning electron microscopy (FESEM) analyses are performed to investigate the optical, structural and morphological properties of the InN/PS nanocomposites. FESEM images show that the pore size of InN/PS nanocomposites is usually less than 4 μm in diameter, and the overall thickness is approximately 40 μm. The InN nanoparticles penetrate uniformly into PS layer and adhere to them very well. Nitrogen (N) and indium (In) can be detected by energy dispersive spectrometer (EDS). An important gradual decrease of the PL intensity for PS occurs with the increase of oxidation time, and the PL intensity of PS is quenched after 24 h oxidization. However, there is a strong PL intensity of InN/PS nanocomposites at 430 nm (2.88 eV), which means that PS substrate can influence the structural and optical properties of the InN, and the grown InN on PS substrate has good optical quality..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 214 (2018)
Micro-Nanostructures
A 45-channel 100 GHz AWG based on Si nanowire waveguides
Kai-li LI, Jia-shun ZHANG, Jun-ming AN, Jian-guang LI, Liang-liang WANG, Yue WANG, Yuan-da WU, Xiao-jie YIN, and Xiong-wei and HU
A 45-channel 100 GHz arrayed waveguide grating (AWG) based on Si nanowire waveguides is designed, simulated and fabricated. Transfer function method is used in the spectrum simulation. The simulated results show that the central wavelength and channel spacing are 1 562.1 nm and 0.8 nm, respectively, which are in accordA 45-channel 100 GHz arrayed waveguide grating (AWG) based on Si nanowire waveguides is designed, simulated and fabricated. Transfer function method is used in the spectrum simulation. The simulated results show that the central wavelength and channel spacing are 1 562.1 nm and 0.8 nm, respectively, which are in accord with the designed values, and the crosstalk is about -23 dB. The device is fabricated on silicon-on-insulator (SOI) substrate by deep ultraviolet lithography (DUV) and inductively coupled plasma (ICP) etching technologies. The 45-channel 100 GHz AWG exhibits insertion loss of 6.5 dB and crosstalk of -8 dB..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 161 (2018)
Optical Fibers and Communications
Anovel soft reliability-based iterative majority-logic decoding algorithm with uniform quantization
Jian-guo YUAN, Zhe WANG, Chang-wei HE, Jin-zhao LIN, and Yu and PANG
In this paper, a novel soft reliability-based iterative majority-logic decoding algorithm with uniform quantization is proposed for regularly structured low density parity-check (LDPC) codes. A weighted measure is introduced for each check-sum of the parity-check matrix and a scaling factor is used to weaken the overesIn this paper, a novel soft reliability-based iterative majority-logic decoding algorithm with uniform quantization is proposed for regularly structured low density parity-check (LDPC) codes. A weighted measure is introduced for each check-sum of the parity-check matrix and a scaling factor is used to weaken the overestimation of extrinsic information. Furthermore, the updating process of the reliability measure takes advantage of turbo-like iterative decoding strategy. The main computational complexity of the proposed algorithm only includes logical and integer operations with the bit uniform quantization criterion. Simulation results show that the novel decoding algorithm can achieve excellent error-correction performance and a fast decoding convergence speed..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 217 (2018)
A novel chromatic dispersion monitoring method for 1 024 QAM fiber-optic system based on asynchronous amplitude sampling
Jia-wei SHEN, Bo ZHU, Fang-ren HU, Si-jia CHEN, and Hang and QU
A new chromatic dispersion (CD) monitoring method is proposed, and the CD monitoring is achieved on the whole range of 0—600 ps/nm. A dual-polarization (DP)-1 024 quadrature amplitude modulation (QAM) 400 Gbit/s CD monitoring system is built using OptiSystem14.0 software. With different optical signal to noise ratio (OA new chromatic dispersion (CD) monitoring method is proposed, and the CD monitoring is achieved on the whole range of 0—600 ps/nm. A dual-polarization (DP)-1 024 quadrature amplitude modulation (QAM) 400 Gbit/s CD monitoring system is built using OptiSystem14.0 software. With different optical signal to noise ratio (OSNR) values, different filter bandwidths or different duty cycles, the simulations are carried out. The simulation results show that this new CD monitoring method can be less affected by noise and has a high tolerance for different filter bandwidths. At the same time, this method can do effective CD monitoring on the signal with duty cycle greater than 80%. A high sensitivity in 0—200 ps/nm can be achieved using this CD monitoring method. The technique supports a wide range of data traffic and enhances operation flexibility of optical networks..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 221 (2018)
A novel timing synchronization for CO-OFDM systems using CAZAC sequences
Li LI, Wang YAO, Li HAN, and Gui-jun and HU
A novel symbol timing synchronization algorithm based on constant amplitude zero auto correlation (CAZAC) sequences is proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. The training symbol of the proposed algorithm is comprised of four different parts, utilizing even symmetry pA novel symbol timing synchronization algorithm based on constant amplitude zero auto correlation (CAZAC) sequences is proposed for coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. The training symbol of the proposed algorithm is comprised of four different parts, utilizing even symmetry property of each part to accomplish timing synchronization. The performance of the proposed algorithm is demonstrated by means of simulations in OFDM and CO-OFDM systems. The proposed algorithm is shown to eliminate the timing sidelobes of Park’s algorithm and has a more accurate timing estimation. In the condition of chromatic dispersion (CD), the timing metric of the proposed method still maintains its peak value at the correct timing point, while the values are almost 0 at all the other positions. Meanwhile, the timing mean square error (MSE) of the proposed algorithm remains around 10-6..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 225 (2018)
DFT-spread combined with clipping method to reduce the PAPR in VLC-OFDM system
LIYang , Rui DENG, Jing HE, Song-hua HE, and Lin and CHEN
Orthogonal frequency division multiplexing (OFDM) is an attractive technique to realize high data rate in light emitting diodes (LEDs)-based visible light communication (VLC). However, high peak-to-average power ratio (PAPR) of OFDM makes VLC-OFDM very sensitive to the nonlinearity of LEDs. In this paper, the discrete Orthogonal frequency division multiplexing (OFDM) is an attractive technique to realize high data rate in light emitting diodes (LEDs)-based visible light communication (VLC). However, high peak-to-average power ratio (PAPR) of OFDM makes VLC-OFDM very sensitive to the nonlinearity of LEDs. In this paper, the discrete Fourier transform-spread (DFT-spread) combined with clipping method is proposed to reduce the PAPR of OFDM signal in VLC system. Combining simulation with experiment, a performance comparison is made among conventional OFDM, DFT-spread-OFDM, and clipped DFT-spread-OFDM with different clipping ratios (CRs) in a single LED-based VLC system. The experimental results show that the proposed clipped DFT-spread-OFDM method can effectively improve the system performance compared with the other two methods. At the optimum signal peak-to-peak (PTP) value, by using the clipped DFT-spread-OFDM scheme with CR at 8 dB, the bit error rate (BER) of the system can be reduced from 0.003 7 to 0.000 287..
Optoelectronics Letters
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 229 (2018)
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