Real-time terahertz(THz)imaging offers remarkable application possibilities,especially in the security and medical fields.However,most THz detectors work with scanners,and a long image acquisition time is required.Som...Real-time terahertz(THz)imaging offers remarkable application possibilities,especially in the security and medical fields.However,most THz detectors work with scanners,and a long image acquisition time is required.Some thermal detectors can achieve realtime imaging by using a focal plane array but have the drawbacks of low sensitivity due to a lack of suitable absorbing materials.In this study,we propose a novel photomechanical meta-molecule array by conveniently assembling THz meta-atom absorbers and bi-material cantilevers together,which can couple THz radiation to a mechanical deflection of the meta-molecules with high efficiency.By optically reading out the mechanical deflections of all of the meta-molecules simultaneously,real-time THz imaging can be achieved.A polyimide sacrificial layer technique was developed to fabricate the device on a glass wafer,which facilitates the transmission of a readout light while the THz wave radiates onto the meta-molecule array directly from the front side.THz images and video of various objects as well as infrared images of the human body were captured successfully with the fabricated metamolecule array.The proposed photomechanical device holds promise in applications in single and broadband THz as well as infrared imaging.展开更多
This paper presents the principle of phase modulation of the optical wave,that is using a dense fringe family to modulate another fringe pattern,and its applicationin fringe multiplication.It is of universal significa...This paper presents the principle of phase modulation of the optical wave,that is using a dense fringe family to modulate another fringe pattern,and its applicationin fringe multiplication.It is of universal significance in optically experimental mechanics.展开更多
Two azobenzene compounds,Disperse Red 1(DR1)and 4-aminoazobenzene(Aazo),were separately linked to poly(acrylic acid)(PAA)side chains to form PAA-DR1 and PAA-Aazo,which were then associated with poly(ethylene oxide)(PE...Two azobenzene compounds,Disperse Red 1(DR1)and 4-aminoazobenzene(Aazo),were separately linked to poly(acrylic acid)(PAA)side chains to form PAA-DR1 and PAA-Aazo,which were then associated with poly(ethylene oxide)(PEO)to produce hydrogen-bonded polymer complex fibers.After UV irradiation,the initial modulus and yielding strength of PAA-Aazo/PEO fiber were both increased tremendously,while the mechanical properties of PAA-DR1/PEO fiber only slightly changed.After drawn and dried in vacuum,PAA-DR1/PEO and PAA-Aazo/PEO fibers with an extended length exhibited a contraction of 20%and 25%under UV irradiation,showing potential for photo-actuation.展开更多
Herein,a series of molecular actuators based on the crystals of(E)-2-(4-fluorostyryl)benzo[d]oxazole(BOAF4),(E)-2-(2,4-difluorostyryl)benzo[d]oxazole(BOAF24),(E)-2-(4-fluorostyryl)benzo[d]thiazole(BTAF4),and(E)-2-(2,4...Herein,a series of molecular actuators based on the crystals of(E)-2-(4-fluorostyryl)benzo[d]oxazole(BOAF4),(E)-2-(2,4-difluorostyryl)benzo[d]oxazole(BOAF24),(E)-2-(4-fluorostyryl)benzo[d]thiazole(BTAF4),and(E)-2-(2,4-difluorostyryl)benzo[d]thiazole(BTAF24)showed unique bending behavior under UV irradiation.The one-dimensional(1D)crystals of BOAF4 and BTAF4 bent toward light,whereas those of BOAF24 and BTAF24 bent away from light.Although the chemical structures of these compounds are similar,the authors found that F···H–C interaction played a key role in the different molecular packing in structures crystals,which led to the positive/negative phototropism of the actuators.Moreover,theoretical calculations were carried out to reveal the mechanical properties of the crystals.Taking advantage of these photomechanical properties,the authors achieved the potential application in pushing objects,as well as enriching and removing pollutants.Hence,the molecular actuators with different bending behavior could be fabricated by introducing different number of F atom,which may open a novel gate for crystal engineering.展开更多
基金This study was funded by the National Natural Science Foundation of China(Grants No.61575003)the China Postdoctoral Science Foundation(Grants Nos.2015M580096 and 2017T100074).
文摘Real-time terahertz(THz)imaging offers remarkable application possibilities,especially in the security and medical fields.However,most THz detectors work with scanners,and a long image acquisition time is required.Some thermal detectors can achieve realtime imaging by using a focal plane array but have the drawbacks of low sensitivity due to a lack of suitable absorbing materials.In this study,we propose a novel photomechanical meta-molecule array by conveniently assembling THz meta-atom absorbers and bi-material cantilevers together,which can couple THz radiation to a mechanical deflection of the meta-molecules with high efficiency.By optically reading out the mechanical deflections of all of the meta-molecules simultaneously,real-time THz imaging can be achieved.A polyimide sacrificial layer technique was developed to fabricate the device on a glass wafer,which facilitates the transmission of a readout light while the THz wave radiates onto the meta-molecule array directly from the front side.THz images and video of various objects as well as infrared images of the human body were captured successfully with the fabricated metamolecule array.The proposed photomechanical device holds promise in applications in single and broadband THz as well as infrared imaging.
文摘This paper presents the principle of phase modulation of the optical wave,that is using a dense fringe family to modulate another fringe pattern,and its applicationin fringe multiplication.It is of universal significance in optically experimental mechanics.
基金National Natural Science Foundation of China(No.51973029)Science and Technology Commission of Shanghai Municipality(No.20JC1414900).
文摘Two azobenzene compounds,Disperse Red 1(DR1)and 4-aminoazobenzene(Aazo),were separately linked to poly(acrylic acid)(PAA)side chains to form PAA-DR1 and PAA-Aazo,which were then associated with poly(ethylene oxide)(PEO)to produce hydrogen-bonded polymer complex fibers.After UV irradiation,the initial modulus and yielding strength of PAA-Aazo/PEO fiber were both increased tremendously,while the mechanical properties of PAA-DR1/PEO fiber only slightly changed.After drawn and dried in vacuum,PAA-DR1/PEO and PAA-Aazo/PEO fibers with an extended length exhibited a contraction of 20%and 25%under UV irradiation,showing potential for photo-actuation.
基金The authors are grateful for financial support from the National Science Foundation of China(nos.51773067 and 21788102)the Open Project of State Key Laboratory of Supramolecular Structure and Materials(no.sklssm202019)+2 种基金the Research Grants Council of Hong Kong(no.C6009-17G)the Innovation of Technology Commission(no.ITC-CNERC14SC01)the National Key Research and Development Program of China(no.2018YFE0190200).
文摘Herein,a series of molecular actuators based on the crystals of(E)-2-(4-fluorostyryl)benzo[d]oxazole(BOAF4),(E)-2-(2,4-difluorostyryl)benzo[d]oxazole(BOAF24),(E)-2-(4-fluorostyryl)benzo[d]thiazole(BTAF4),and(E)-2-(2,4-difluorostyryl)benzo[d]thiazole(BTAF24)showed unique bending behavior under UV irradiation.The one-dimensional(1D)crystals of BOAF4 and BTAF4 bent toward light,whereas those of BOAF24 and BTAF24 bent away from light.Although the chemical structures of these compounds are similar,the authors found that F···H–C interaction played a key role in the different molecular packing in structures crystals,which led to the positive/negative phototropism of the actuators.Moreover,theoretical calculations were carried out to reveal the mechanical properties of the crystals.Taking advantage of these photomechanical properties,the authors achieved the potential application in pushing objects,as well as enriching and removing pollutants.Hence,the molecular actuators with different bending behavior could be fabricated by introducing different number of F atom,which may open a novel gate for crystal engineering.