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[ACM Press SIGGRAPH ASIA 2016 Symposium on Visualization - Macau (2016.12.05-2016.12.08)] SIGGRAPH ASIA 2016 Symposium on Visualization on - SA '16 - Evaluating the perception of semi-transparent structures in direct volume rendering techniques
摘要： Direct volume rendering (DVR) provides the possibility to visualize volumetric data sets as they occur in many scientific disciplines. A key benefit of DVR is that semi-transparency can be facilitated in order to convey the complexity of the visualized data. Unfortunately, semi-transparency introduces new challenges in spatial comprehension of the visualized data, as the ambiguities inherent to semi-transparent representations affect spatial comprehension. Accordingly, many visualization techniques have been introduced to enhance the spatial comprehension of DVR images. In this paper, we conduct a user evaluation in which we compare standard DVR with five visualization techniques which have been proposed to enhance the spatial comprehension of DVR images. In our study, we investigate the perceptual performance of these techniques and compare them against each other to find out which technique is most suitable for different types of data and purposes. In order to do this, a large-scale user study was conducted with 300 participants who completed a number of micro-tasks designed such that the aggregated feedback gives us insight on how well these techniques aid the end user to perceive depth and shape of objects. Within this paper we discuss the tested techniques, present the conducted study and analyze the retrieved results.
关键词： Volume rendering,transparency,depth perception
更新于2025-09-19 17:15:36
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Acoustic wave transparency in nitrogen-vacancy centers in a photonic crystal
摘要： We show that the interaction of nitrogen-vacancy centers in diamond with a strain field in a photonic crystal can lead to acoustic wave transparency. This occurs due to the strong interaction of photons with the modified photonic reservoir near the photonic band edge created by the photonic crystal. For achieving this, we explore the properties of the spin states of the ground state of the nitrogen-vacancy centers, where one transition interacts with a strain field while the other transition has spontaneous emission that occurs near the edge of the photonic band gap, which should be in the microwave regime. We show that depending on the form of the photonic density of states acoustic wave transparency is obtained at one or two frequencies.
关键词： Induced transparency,Photonic crystal,Non-Markovian dynamics,Acoustic field,Nitrogen-vacancy center in diamond
更新于2025-09-19 17:15:36
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Numerical simulation of charge transport layer free perovskite solar cell using metal work function shifted contacts
摘要： Perovskite solar cells (PSCs) are one of the fastest emerging photovoltaic (PV) technology at the research level. To achieve higher conversion efficiencies from PSCs, a perovskite absorber layer is stacked between two charge transport layers (CTLs) such as electron and hole transport layers. However, fabrication of defect-free multi-layered PSC is a challenging task, and the presence of CTL and their corresponding interfaces with perovskite enhances the recombination, hysteresis and led to poor stability. Here, in this work, CTL free (i.e., electron and hole transport layer free) PSC is simulated using metal work function shifted contacts. The device presented in this work is free from transport layers and the collection process is with the help of an electric field across the perovskite layer. The electric field is created by using two metals of different work function, i.e., 4.35eV and 5.25eV (can be realized using self-assembled monolayers technique) used as cathode and anode respectively. Simulated CTL free PSC exhibits JSC=17.8 mA.cm-2, VOC=712 mV, FF=68.5% and PCE=8.7% with 250 nm thick perovskite absorber layer having bulk defect density of 2.5x1013 cm-3. Further, a comprehensive study is done in terms of front electrode work function (FEW), front electrode transparency, perovskite thickness and bulk defect density to understand the impact of these parameters on the performance of the device. To understand the behavior of the device, the energy band diagram profile is examined. Reported results show that higher metal work function difference between front and back electrode, higher transparency, and thick perovskite layer with low defect density results in better PV effect in CTL free PSC. Optimized CTL free PSC device delivers JSC=19.9 mA.cm-2, VOC=726 mV, FF=66.8% and PCE=9.7%. The design simulated in this work opens up a new window for next-generation interface defect and hysteresis-free PSC.
关键词： simulation,absorption,SCAPS-1D.,charge transport layer,metal work function,Perovskite solar cell,transparency
更新于2025-09-19 17:13:59
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Plasmon Induced Transparency in Graphene-based Side Coupled two Rectangular Nano-cavities-like structures
摘要： We investigate numerically the plasmon analogue of electromagnetic induced transparency (EIT) in a compact graphene-based waveguide coupled to two rectangular nano-cavities-like structures made out of graphene nanoribbons. The cavities are placed symmetrically on each side of the bus waveguide, giving rise to a V-like state in analogy with three level atomic systems. In this configuration, the cavities are directly coupled to the waveguide, and consequently both play the role of the bright mode. By slightly detuning the Fermi energy level of the cavities, we show the possibility of generating a narrow transparency window, that’s, the plasmon induced transparency (PIT). The resonance peak occurs as a consequence of destructive interference between the cavities acting like coupled radiative oscillators. We also demonstrate that by appropriately shifting (symmetrically) the Fermi energy levels of the cavities, one could dynamically tune the resonance peak frequency. The proposed structure may help the design of highly integrated optical devices.
关键词： Nanomaterials,Plasmon induced transparency,Graphene waveguide,Metamaterials,Surface plasmons
更新于2025-09-19 17:13:59
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Tunable plasmon induced transparency in the ellipse-shaped resonators coupled waveguide
摘要： We study spectral responses in a bright-dark mode ellipse-shaped resonators coupled waveguide. The results show that the plasmon-induced transparency (PIT) can be observed in the ellipse-shaped resonators coupled waveguide, and the symmetric line shape at the PIT window can be tuned by the radii of the long axis in ellipse-shaped resonators, the coupling distance, and the symmetry broken degree. Interestingly, the radii of the long axis for the bright mode and dark mode have opposite effect on the spectra of PIT. Our research results may pave the way for the understanding and tuning of PIT
关键词： Plasmon-induced transparency,Surface plasmon,metal-dielectric-metal waveguide
更新于2025-09-19 17:13:59
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Numerical and Theoretical Study of Tunable Plasmonically Induced Transparency Effect Based on Brighta??Dark Mode Coupling in Graphene Metasurface
摘要： In this paper, we numerically and theoretically study the tunable plasmonically induced transparency (PIT) effect based on the graphene metasurface structure consisting of a graphene cut wire (CW) resonator and double split-ring resonators (SRRs) in the middle infrared region (MIR). Both the theoretical calculations according to the coupled harmonic oscillator model and simulation results indicate that the realization of the PIT effect significantly depends on the coupling distance and the coupling strength between the CW resonator and SRRs. In addition, the geometrical parameters of the CW resonator and the number of the graphene layers can alter the optical response of the graphene structure. Particularly, compared with the metal-based metamaterial, the PIT effect realized in the proposed metasurface can be flexibly modulated without adding other actively controlled materials and reconstructing the structure by taking advantage of the tunable complex surface conductivity of the graphene. These results could find significant applications in ultrafast variable optical attenuators, sensors and slow light devices.
关键词： plasmonically induced transparency effect,metasurface,mid-infrared region,graphene split-ring resonators,graphene cut wire resonator
更新于2025-09-19 17:13:59
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Additive‐free electrophoretic deposition of graphene quantum dots thin films
摘要： The electrophoretic deposition (EPD) of graphene-based materials on transparent substrates is highly potential for many applications. Several factors can determine the yield of EPD process, such as applied voltage, deposition time, and particularly the presence of dispersion additives (stabilizers) in the suspension solution. This study presents an additive-free EPD of GQDs thin films on Indium Tin Oxide (ITO) glass substrate and studies the deposition mechanism with the variation of the applied voltage (10 – 50 V) and deposition time (5 – 25 min). It is found that due to the small size (~3.9 nm) and high content of deprotonated carboxylic groups, the GQDs form a stable dispersion (zeta potential of about –35 mV) without using additives. The GQDs thin films can be deposited onto ITO with optimal surface morphology at 30 V in 5 min (surface roughness of approximately 3.1 (±1.3) nm). In addition, as-fabricated GQDs thin films also possess some interesting physico-optical properties, such as a double-peak photoluminescence at about 417 and 439 nm, with ca. 98% visible transmittance. This low cost and eco-friendly GQDs thin film is a promising material for various applications, e.g. transparent conductors, supercapacitors, and heat conductive film in smart windows.
关键词： visible transparency,graphene quantum dots,thin film,electrophoretic deposition,additive free
更新于2025-09-19 17:13:59
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Absorption and opacity threshold for a thin foil in a strong circularly polarized laser field
摘要： We show that a commonly accepted transparency threshold for a thin foil in a strong circularly polarized normally incident laser pulse needs a refinement. We present an analytical model that correctly accounts for laser absorption. The refined threshold is determined not solely by the laser amplitude, but by other parameters that are equally or even more important. Our predictions are in perfect agreement with particle-in-cell simulations. The refined criterion is crucial for configuring laser plasma experiments in the high-field domain. In addition, an opaque foil steepens the pulse front, which can be important for numerous applications.
关键词： particle-in-cell simulations,transparency threshold,circularly polarized laser field,laser absorption,thin foil
更新于2025-09-19 17:13:59
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Tunable Triple-Band Plasmonically Induced Transparency Effects Based on Double π-Shaped Metamaterial Resonators
摘要： Tunable triple-peaks with the transmission intensity of more than 90% plasmonically induced transparency metamaterial resonator based on nested double π-shaped metallic structure is proposed at the terahertz frequency region, which is consisted of three sets of gold nanorods with different sizes placed on a dielectric substrate of SiO2. The coupling effect of localized electric field between different parts of the proposed structure can be used to explain the physical mechanism of three transparent windows. The finite-difference time-domain (FDTD) is used to study the spectral properties of the proposed structure, and the influence of the size of the nanorods and the relative distance between them on the spectral characteristics are also discussed. It can be seen that some obvious shift phenomena occur in the spectra with the change of these nanorods. These results indicate that the proposed structure opens up new avenues in many related applications, especially for multi-channel filters, optical switches, and sensors.
关键词： Double π-shaped resonator,Plasmonically induced transparency,Metamaterials,Terahertz
更新于2025-09-16 10:30:52
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Optically induced transparency in coupled micro-cavities: tunable Fano resonance
摘要： We theoretically investigate the phenomena of optically induced transparency for a weak probe ?eld and tunable asymmetric Fano line shape in coupled micro-cavities. One of the cavities is passive, consists of optical Kerr medium and coupled via photon tunnelling to an active cavity. The forward transmission and backward re?ection pro?le of the output ?elds are analyzed for both passive-passive and passive-active cavity system by varying di?erent system parameters. The transmission spectra show tunable transparency window and sharp asymmetric Fano line shape structure. The sharpness of line shape pro?le is controlled via the gain-to-loss ratio, photon tunnelling strength, Kerr nonlinear strength and input power. The ?ndings in this study have the potential to be used as a highly sensitive sensor and also useful for telecom system.
关键词： photon tunnelling,Optically induced transparency,Fano resonance,coupled micro-cavities,Kerr medium
更新于2025-09-16 10:30:52