Position sensitive device(PSD)sensor is a vital optical element that is mainly used in tracking systems for visible light communication(VLC).Recently,a new reconfigurable PSD architecture emerged.The proposed architec...Position sensitive device(PSD)sensor is a vital optical element that is mainly used in tracking systems for visible light communication(VLC).Recently,a new reconfigurable PSD architecture emerged.The proposed architecture makes the PSD perform more functions by modifying its architecture.As the PSD is mainly formed of an array of photodiodes.The primary concept involves employing transistors to alternate between the operating modes of the photodiodes(photoconductive and photovoltaic).Additionally,alternating among output pins can be done based on the required function.This paper presents the mathematical modeling and simulation of a reconfigurable-multifunctional optical sensor which can perform energy harvesting and data acquisition,as well as positioning,which is not available in the traditional PSDs.Simulation using the MATLAB software tool was achieved to demonstrate the modeling.The simulation results confirmed the validity of the mathematical modeling and proved that the modified sensor architecture,as depicted by the equations,accurately describes its behavior.The proposed sensor is expected to extend the battery's lifecycle,reduce its physical size,and increase the integration and functionality of the system.The presented sensor might be used in free space optical(FSO)communication like cube satellites or even in underwater wireless optical communication(UWOC).展开更多
Micro thermoelectric device(μ-TED)emerges with great attention in energy generation,thermal management,and heat sensing applications.However,the large sensitive area is necessary to accommodate enough thermoelectric ...Micro thermoelectric device(μ-TED)emerges with great attention in energy generation,thermal management,and heat sensing applications.However,the large sensitive area is necessary to accommodate enough thermoelectric couples(TCs)for a high thermoelectric performance.This limits the potential in micro energy harvesting and ultrasensitive sensing applications.Here,we adopted an optimized MEMS-based process to fabricate the ultra-sensitive micro-thermoelectric device(μ-TED).With the help of MEMS-compatible electrochemical deposition,the small size(25μm),high aspect ratio(1:1.25),and alternating distributed P/N structures are achieved.As a result,theμ-TED realizes an ultra-high integration density of 19,900 thermoelectric couples per cm2.Moreover,it shows a great thermoelectric sensitivity of 212 mV/(K·cm2)and a competitive power factor of 0.51μW/(K2·cm2),which means theμ-TED is competent for miniaturized applications.Additionally,theμ-TED shows an ultra-low detection limit of 5 mm/s and a short response time of 100 ms,revealing great potential in fast detections of the ultra-low airflow.Furthermore,the ultra-sensitiveμ-TED is utilized as a flexible breath sensor,due to its compact size.The breath signal of different motion states is successfully detected.These results confirm that the ultra-sensitiveμ-TED holds outstanding potential for ultra-sensitive airflow sensing and energy harvesting devices.展开更多
We propose and analyze a silicon hybrid plasmonic polarization splitter-rotator with an ultra-short footprint using an asymmetric bent directional coupler on a silicon-on-insulator platform.Benefitting from the large ...We propose and analyze a silicon hybrid plasmonic polarization splitter-rotator with an ultra-short footprint using an asymmetric bent directional coupler on a silicon-on-insulator platform.Benefitting from the large birefringence induced by the bent structure and plasmonic effect,the cross-polarization coupling length is only 5.21μm.The transverse magnetic to transverse electric polarization conversion efficiency is over 99.9%,with an extinction ratio of 20.6 dB(32.5 dB)for the transverse magnetic(transverse electric)mode at 1.55μm.Furthermore,the polarization conversion efficiency is higher than 90%while maintaining cross talk below-19 dB within the bandwidth of 80 nm.展开更多
文摘Position sensitive device(PSD)sensor is a vital optical element that is mainly used in tracking systems for visible light communication(VLC).Recently,a new reconfigurable PSD architecture emerged.The proposed architecture makes the PSD perform more functions by modifying its architecture.As the PSD is mainly formed of an array of photodiodes.The primary concept involves employing transistors to alternate between the operating modes of the photodiodes(photoconductive and photovoltaic).Additionally,alternating among output pins can be done based on the required function.This paper presents the mathematical modeling and simulation of a reconfigurable-multifunctional optical sensor which can perform energy harvesting and data acquisition,as well as positioning,which is not available in the traditional PSDs.Simulation using the MATLAB software tool was achieved to demonstrate the modeling.The simulation results confirmed the validity of the mathematical modeling and proved that the modified sensor architecture,as depicted by the equations,accurately describes its behavior.The proposed sensor is expected to extend the battery's lifecycle,reduce its physical size,and increase the integration and functionality of the system.The presented sensor might be used in free space optical(FSO)communication like cube satellites or even in underwater wireless optical communication(UWOC).
基金supported by the Project(NO.62502010320)the National Key Research and Development Program of China(2020YFB2009102).
文摘Micro thermoelectric device(μ-TED)emerges with great attention in energy generation,thermal management,and heat sensing applications.However,the large sensitive area is necessary to accommodate enough thermoelectric couples(TCs)for a high thermoelectric performance.This limits the potential in micro energy harvesting and ultrasensitive sensing applications.Here,we adopted an optimized MEMS-based process to fabricate the ultra-sensitive micro-thermoelectric device(μ-TED).With the help of MEMS-compatible electrochemical deposition,the small size(25μm),high aspect ratio(1:1.25),and alternating distributed P/N structures are achieved.As a result,theμ-TED realizes an ultra-high integration density of 19,900 thermoelectric couples per cm2.Moreover,it shows a great thermoelectric sensitivity of 212 mV/(K·cm2)and a competitive power factor of 0.51μW/(K2·cm2),which means theμ-TED is competent for miniaturized applications.Additionally,theμ-TED shows an ultra-low detection limit of 5 mm/s and a short response time of 100 ms,revealing great potential in fast detections of the ultra-low airflow.Furthermore,the ultra-sensitiveμ-TED is utilized as a flexible breath sensor,due to its compact size.The breath signal of different motion states is successfully detected.These results confirm that the ultra-sensitiveμ-TED holds outstanding potential for ultra-sensitive airflow sensing and energy harvesting devices.
基金partially supported by the National Natural Science Foundation of China(NSFC)(Nos.61827817 and 61525501)。
文摘We propose and analyze a silicon hybrid plasmonic polarization splitter-rotator with an ultra-short footprint using an asymmetric bent directional coupler on a silicon-on-insulator platform.Benefitting from the large birefringence induced by the bent structure and plasmonic effect,the cross-polarization coupling length is only 5.21μm.The transverse magnetic to transverse electric polarization conversion efficiency is over 99.9%,with an extinction ratio of 20.6 dB(32.5 dB)for the transverse magnetic(transverse electric)mode at 1.55μm.Furthermore,the polarization conversion efficiency is higher than 90%while maintaining cross talk below-19 dB within the bandwidth of 80 nm.
