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Color filters based on a nanoporous Al-AAO resonator featuring structure tolerant color saturation.
Yue, Wenjing,Li, Yang,Wang, Cong,Yao, Zhao,Lee, Sang-Shin,Kim, Nam-Young Optical Society of America 2015 Optics express Vol.23 No.21
<P>Reflection type subtractive tri-color filters, enabling metal-thickness tolerant high color saturation, were proposed and demonstrated capitalizing on a nanoporous metal-dielectric-metal (MDM) resonant structure, which comprises a cavity made of self-assembled nanoporous anodic aluminum oxide (AAO), sandwiched between an Al film of the same nanoporous configuration and a highly reflective aluminum (Al) substrate. For the proposed filter, the output color was easily determined by controlling the resonance wavelength via the thickness of the porous AAO cavity. In particular, the spectral response was deemed to exhibit a near-zero resonant dip, thereby achieving enhanced color saturation, which was stably maintained irrespective of the thickness of the porous Al film, due to its reduced effective refractive index. In order to manufacture the proposed color filters on a large scale, a porous Al film of hexagonal lattice configuration was integrated with an identically porous self-assembled AAO layer, which has been grown on an Al substrate. For the realized tri-color filters for cyan, magenta, and yellow (CMY), having a 15-nm Al film, near-zero reflection dips were observed to be centered at the wavelengths of 436, 500, and 600 nm, respectively. The resulting enhanced color saturation was stably maintained even though the variations were as large as 10 nm in the metal thickness.</P>
Uniformly thick tri-color filters capitalizing on an etalon with a nanostructured cavity
Yue, Wenjing,Lee, Sang-Shin,Kim, Eun-Soo,Lee, Byung-Gook The Optical Society 2015 Applied Optics Vol.54 No.18
<P>Highly efficient tri-color filters having uniform thickness are proposed based on an etalon tapping into a nanostructured cavity, where a hexagonal lattice of nanopillars (NPs) with a high refractive index is embedded in a base material with a low index. The nanostructured cavity is presumed to behave as a homogeneous medium, which provides a wide range for the effective refractive index in accordance with both the volume fraction of the NPs and the index contrast between the NPs and the base. Hence, for the etalon-based filters, the resonance wavelength can be efficiently tuned by simply altering the effective index rather than the thickness of the cavity, so as to span the entire visible regime including red, green, and blue (RGB) colors. In particular, a hexagonal lattice of NPs was introduced to extend the available range of effective index due to its highly flexible volume fraction. The NP-base index contrast has been pertinently maximized to achieve effective indices leading to RGB colors, to the extent that the nanostructured cavity can be safely modeled as a homogeneous medium. The proposed RGB color filters were finally designed to have an identical thickness of 240 nm by setting the diameters of the NPs at 95, 70, and 40 nm, to achieve a periodicity of 100 nm, considering that TiO2 and Al2O3 can be practically selected as the material candidate for the NPs and the base, respectively. A high transmittance of ???78% and a suitable 1 dB bandwidth of ???51??????nm were obtained for the tri-color filters, which were further confirmed to exhibit polarization-independent transfer characteristics.</P>
( Wenjing Yue ),( Yapeng Ren ),( Zhen Yang ),( Zhi Chen ),( Qingmin Meng ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10
This paper introduces a full duplex single secondary user multiple-input multiple-output (FD-SSU-MIMO) cognitive radio network, where secondary user (SU) opportunistically accesses the authorized spectrum unoccupied by primary user (PU) and transmits data based on FD-MIMO mode. Then we study the network achievable average sum-rate maximization problem under sum transmit power budget constraint at SU communication nodes. In order to solve the trade-off problem between SU`s sensing time and data transmission time based on opportunistic spectrum access (OSA) and the power allocation problem based on FD-MIMO transmit mode, we propose a simple trisection algorithm to obtain the optimal sensing time and apply an alternating optimization (AO) algorithm to tackle the FD-MIMO based network achievable sum-rate maximization problem. Simulation results show that our proposed sensing time optimization and AO-based optimal power allocation strategies obtain a higher achievable average sum-rate than sequential convex approximations for matrix-variable programming (SCAMP)-based power allocation for the FD transmission mode, as well as equal power allocation for the half duplex (HD) transmission mode.
Wenjing Yue,김행정,이상신 한국광학회 2013 Current Optics and Photonics Vol.17 No.6
A portable infrared laser transmitter delivering a highly uniform detectable beam was demonstrated. Itincorporates a flexible beam shaper, comprising a perforated diffuser sheet in conjunction with a pinhole. The beam shaper plays the prominent role of flexibly tailoring the incoming light via both scattering anddiffraction, in order to equalize the effective beam width over a long distance. The intensity profile ofa generated beam was practically observed, demonstrating that a substantially uniform beam of 70-cm widthwas achieved for a given threshold detection level, with an average deviation of 6% over a range of 600m.
Deqing Ruan,Wenjing Liu,Yanhong Shi,Menghui Tan,Li Yang,Zhengtao Wang,Yue Zhou,Rui Wang 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.1
Endotoxic shock exhibits a considerably high mortality risk. It is defined as a systemic inflammatory response syndrome caused by a microbial infection. Radix Isatidis has anti-inflammatory, antiviral, and antipyretic effects and is used worldwide. This study investigated the antiendotoxin sepsis effects of an aqueous R. Isatidis extract (RIE) and explored the possible pharmacological molecular mechanisms. Male C57BL/6J mice were intravenously injected with 15 mg/kg lipopolysaccharide (LPS) to induce endotoxic shock. The results demonstrated that the survival rate of mice pretreated with RIE increased, and LPS-induced liver and lung damage were reduced by inhibiting inflammation. For elucidating detailed molecular mechanisms, we focused on LPS-induced transcription factors: nuclear factor-κB (NF-κB) and interferon regulatory factor 3 (IRF3). Our results demonstrated that the protective effects of RIE were strongly dependent on IRF3-induced interferon-β, not on NF-κB-induced tumor necrosis factor-α and interleukin-1β. In addition, RIE suppressed the phosphorylation of IRF3, not NF-κB. In conclusion, this study revealed the antiendotoxic properties of RIE on LPS-induced sepsis and provided mechanistic evidence for the beneficial effects of RIE.
Song Gao,Wenjing Yue,이상신 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
An enzyme-free optical method is proposed for estimating high concentrations of glucose in aglucose-lactose mixture, based on a predictive equation that takes advantage of the reflective optical powerobserved at two discrete wavelengths. Compared to the conventional absorption spectroscopy method basedon Beer’s Law, which is mainly valid for concentrations below hundreds of mg/dL, the proposed scheme,which relies on reflection signals, can be applied to measure higher glucose concentrations, of even severalg/dL in a glucose-lactose mixture. Two probe wavelengths of 1160 and 1300 nm were selected to providea linear relationship between the reflective power and pure glucose/lactose concentration, where the relevantlinear coefficients were derived to complete the predictive equation. Glucose concentrations from 2 to 7g/dL in a glucose-lactose mixture were efficiently estimated, using the established predictive equation basedon monitored reflective powers. The standard error of prediction was 1.17 g/dL.
Design of an Alignment Tolerant Miniature Optical Subassembly Module
Hak-Soon Lee,Wenjing Yue,Sang-Shin Lee IEEE 2014 IEEE photonics journal Vol.6 No.2
<P>A miniature optical subassembly module incorporating a pair of collimating and focusing lenses was proposed and designed to provide affordable alignment tolerance in terms of optical coupling efficiency. The light source was specifically modeled taking advantage of multiple point sources placed on the emitting aperture. This scheme was practically verified to be superior to the conventional scheme involving a single point source by estimating the focal length and spot size of a focused beam. The performance of the proposed source modeling was scrutinized with respect to the number of point sources. The optical coupling of the subassembly to a fiber was investigated theoretically and experimentally in light of the characteristics of the displacement of the focused beam relative to the lateral displacement of the light source. Finally, a tradeoff between the positional 3-dB tolerance of the light source and the maximum available coupling efficiency was established with certitude.</P>