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| 1 | High resolution multispectral spatial light modulators based on tunable Fabry-Perot nanocavities显示文摘Spatial light modulators(SLMs)are the most relevant technology for dynamic wavefront manipulation.They find diverse applications ranging from novel displays to optical and quantum communications.Among commercial SLMs for phase modulation,Liquid Crystal on Silicon(LCoS)offers the smallest pixel size and,thus,the most precise phase mapping and largest field of view(FOV).Further pixel miniaturization,however,is not possible in these devices due to inter-pixel cross-talks,which follow from the high driving voltages needed to modulate the thick liquid crystal(LC)cells that are necessary for full phase control.Newly introduced metasurface-based SLMs provide means for pixel miniaturization by modulating the phase via resonance tuning.These devices,however,are intrinsically monochromatic,limiting their use in applications requiring multi-wavelength operation.Here,we introduce a novel design allowing small pixel and multi-spectral operation.Based on LC-tunable Fabry-Perot nanocavities engineered to support multiple resonances across the visible range(including red,green and blue wavelengths),our design provides continuous 2π phase modulation with high reflectance at each of the operating wavelengths.Experimentally,we realize a device with 96 pixels(~1 μm pitch)that can be individually addressed by electrical biases.Using it,we first demonstrate multi-spectral programmable beam steering with FOV~18° and absolute efficiencies exceeding 40%.Then,we reprogram the device to achieve multi-spectral lensing with tunable focal distance and efficiencies~27%.Our design paves the way towards a new class of SLM for future applications in displays,optical computing and beyond. | Shampy Mansha Parikshit Moitra Xuewu Xu Tobias Wwmass Rasna Maruthiyodan Veetil Xinan Liang Shi-Qiang Li Ramon Paniagua-Dominguez Arseniy I.Kuznetsov | 2022 | Light(Science & Applications)2022，11，6： | 3 |
| 2 | Kinetic models of natural gas combustion in an internal combustion engine显示文摘In this study, combustion of methane was simulated using four kinetic models of methane in CHEMKIN 4.1.1 for 0-D closed internal combustion (IC) engine reactor. Two detailed (GRIMECH3.0 & UBC MECH2.0) and two reduced (One step & Four steps) models were examined for various IC engine designs. The detailed models (GRIMECH3.0, & UBC MECH2.0) and 4-step models successfully predicted the combustion while global model was unable to predict any combustion reaction. This study illustrated that the detailed model showed good concordances in the prediction of chamber pressure, temperature and major combustion species profiles. The detailed models also exhibited the capabilities to predict the pollutants formation in an IC engine while the reduced schemes showed failure in the prediction of pollutants emissions. Although, there are discrepancies among the profiles of four considered model, the detailed models (GRIMECH3.0 & UBC MECH2.0) produced the acceptable agreement in the species prediction and formation of pollutants. | M. Mansha A. R Saleemi Badar M. Ghauri | 2010 | Journal of Natural Gas Chemistry2010，19，1： | 2 |
| 3 | Terahertz emission from localized modes in one-dimensional disordered systems [Invited]显示文摘We demonstrate terahertz(THz) frequency laser emission around 3.2 THz from localized modes in one-dimensional disordered grating systems. The disordered structures are patterned on top of the double-metal waveguide of a THz quantum cascade laser. Multiple emission peaks are observed within a frequency range corresponding to the bandgap of a periodic counterpart with no disorder, indicating the presence of mode localization aided by Bragg scattering. Simulations and experimental measurements provide strong evidence for the spatial localization of the THz laser modes. | YONGQUAN ZENG GUOZHEN LIANG Bo QIANG Bo MENG Hou KUN LIANG SHAMPY MANSHA JIANPING LI ZHAOHUI L LIANHE LI ALEXANDER GILES DAVIES EDMUND HAROLD LINFIELD YING ZHANG YIDONG CHONG AND Qi JIE WANG | 2018 | Photonics Research2018，6，2： | 1 |
| 4 | Prediction and measurement of pollutant emissions in CNG fired internal combustion engine显示文摘In the present study, the detailed reaction mechanisms were developed and Chemkin 4.1.1 was implemented to predict the formation of pollutant species in compressed natural gas (CNG) fired internal combustion (IC) engine. The proposed mechanisms were developed by coupling the EXGAS (an automatic mechanism generation tool for alkane oxidation) mechanisms with the Leed's NOx mechanism (version 2.0). The simulation results of each proposed mechanism were validated by the experimental measurements for profiles of temperature, pressure and pollutant species (CO, NOx). The rate of production analysis of each mechanism identified the important reactions in each mechanism which contributed to the formation of pollutant species. In spite of some discrepancies, the experimental measurements indicate that Mechanism-IV (consisting of 208 reactions and 78 species) showed closer agreement for each of the predicted profiles of temperature, pressure and pollutant species (CO, NOx). | M. Mansha A. R. Saleemt Javed S. H Badar M. Ghauri | 2010 | Journal of Natural Gas Chemistry2010，19，5： | 1 |
| 5 | Characterization and source apportionment of ambient air particulate matter (PM 2.5 ) in Karachi显示文摘 | M. Mansha Badar Ghauri Said Rahman Arif Amman | 2011 | Science of the Total Environment2011，，： | 1 |
| 6 | Promyelocytic leukemia zinc finger protein (PLZF) enhances glucocorticoid-induced apop- tozis in leukemic cell line NALM6显示文摘 | Wasim M Mansha M Kofler A | 2012 | Pak J Pharm Sci2012，25，3： | 1 |
| 7 | Day case laparoscopic cholecystectomy is safe and feasible:a case controlled study显示文摘 | Rathore MA Andrabi SI Mansha M | 2007 | Int J Surg2007，5，4： | 1 |
| 8 | Early results of a simple distraction dynamic external fixator in management of eomminuted intra-articular fractures of base of middle phalanx 显示文摘 | Mansha M Miranda S | 2013 | J Hand Mierosurg2013，5，2： | 1 |
| 9 | Chemically modified electrodes for electrochemical detection of dopamine in the pres ence of uric acid and aseorbic acid: A review显示文摘 | SAJID M NAZAL M K MANSHA M | 2016 | Trends in Analytical Chemistry2016，76，： | 1 |
| 10 | Speed-flow analysis for inter- rupted oversaturated traffic flow with heterogeneous struc- ture for urban roads显示文摘 | Hemant K S Mansha S | 2012 | International Journal for Traffic Transport Engineering2012，2，2： | 1 |
| 11 | Day case laparoscopic cholecystectomy is safe and feasible:a case controlled study显示文摘 | RATHORE MA ANDRABI SI MANSHA M | 2007 | Int J Surg2007，5，4： | 1 |
| 12 | Day case laparoscopic cholecystectomy is safe and feasible:a case controlled study显示文摘 | Rathore MA Andrabi SI Mansha M | 2007 | Int J Surg2007，5，4： | 1 |
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