We present both numerical and experimental results to study the diffraction of twisted light beams based on orbital angular momentum（OAM） eigenmode decomposition,where the total initial field,including light and ape...We present both numerical and experimental results to study the diffraction of twisted light beams based on orbital angular momentum（OAM） eigenmode decomposition,where the total initial field,including light and aperture,is represented by a two-dimensional spectrum of Laguerre-Gaussian modes.We use a phase-only spatial hght modulator to display a holographic grating for both generating the twisted light and mimicking the finite aperture.We take a triangular aperture as an example to describe the diffraction behavior of a twisted hght beam carrying an OAM number of l=3 from the near-field to far-field regions,where the interesting gradual formation of triangular bright lattices are observed.An excellent agreement between the numerical simulations and experimental observations is clearly seen.It is noted that this method is particularly useful for the study of the diffraction of twisted light fields incident on any apertures of rotational symmetry.展开更多
In the process of high-harmonic generation with a Laguerre-Gaussian （LG） mode, it was well established that the topological charge could be of an N-fold increase due to angular momentum conservation. Here, by mimick...In the process of high-harmonic generation with a Laguerre-Gaussian （LG） mode, it was well established that the topological charge could be of an N-fold increase due to angular momentum conservation. Here, by mimicking the effect of high-harmonic generation, we devise a simple algorithm to generate optical vortex arrays carrying arbitrary topological charges with a single phase-only spatial light modulator. By initially preparing a coaxial superposition of suitable low-order LG modes, we demonstrate experimentally that the topological charges of the embedded vortices can be multiplied and transformed into arbitrarily high orders on demand, while the array structure remains unchanged. Our algorithm offers a concise way to efficiently manipulate the structured light beams and holds promise in optical micromanipulation and remote sensing.展开更多
基金supported by the National Natural Science Foundation of China(No.11474238)the Natural Science Foundation of Fujian Province of China for Distinguished Young Scientists(No.2015J06002)+1 种基金the Fundamental Research Funds for the Central Universities at Xiamen University(Nos.20720160040,20720150166,and 201412G011)the Program for New Century Excellent Talents in Fujian Province University and the program for New Century Excellent Talents in University of China(Grant No.NCET-13-0495)
文摘We present both numerical and experimental results to study the diffraction of twisted light beams based on orbital angular momentum（OAM） eigenmode decomposition,where the total initial field,including light and aperture,is represented by a two-dimensional spectrum of Laguerre-Gaussian modes.We use a phase-only spatial hght modulator to display a holographic grating for both generating the twisted light and mimicking the finite aperture.We take a triangular aperture as an example to describe the diffraction behavior of a twisted hght beam carrying an OAM number of l=3 from the near-field to far-field regions,where the interesting gradual formation of triangular bright lattices are observed.An excellent agreement between the numerical simulations and experimental observations is clearly seen.It is noted that this method is particularly useful for the study of the diffraction of twisted light fields incident on any apertures of rotational symmetry.
基金supported by the National Natural Science Foundation of China(NSFC)(Nos.11104233 and 11474238)the Fundamental Research Funds for the Central Universities(No.20720160040)+1 种基金the Natural Science Foundation of Fujian Province(No.2015J06002)the Program for New Century Excellent Talents in University(NCET)(NCET-13-0495)
文摘In the process of high-harmonic generation with a Laguerre-Gaussian （LG） mode, it was well established that the topological charge could be of an N-fold increase due to angular momentum conservation. Here, by mimicking the effect of high-harmonic generation, we devise a simple algorithm to generate optical vortex arrays carrying arbitrary topological charges with a single phase-only spatial light modulator. By initially preparing a coaxial superposition of suitable low-order LG modes, we demonstrate experimentally that the topological charges of the embedded vortices can be multiplied and transformed into arbitrarily high orders on demand, while the array structure remains unchanged. Our algorithm offers a concise way to efficiently manipulate the structured light beams and holds promise in optical micromanipulation and remote sensing.
