We present a method to efficiently multiply or divide the orbital angular momentum(OAM)of light beams using a sequence of two optical elements.The key element is represented by an optical transformation mapping the az...We present a method to efficiently multiply or divide the orbital angular momentum(OAM)of light beams using a sequence of two optical elements.The key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector.By combining multiple circular-sector transformations into a single optical element,it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular sectors.Conversely,by combining multiple inverse transformations,the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase gradients.Optical elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography.Optical tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM,whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM beams.These elements can find applications for the multiplicative generation of higher-order OAM modes,optical information processing based on OAM beam transmission,and optical routing/switching in telecom.展开更多
The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,t...The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,the exploitation of high-intensity beams can result destructive for standard optical elements and setups.A recent publication suggests a solution to overcome all those limitations,by probing highly-intense vortex pulses with a structured reference beam in a strong-field photoionization process.展开更多
Analogous to the behavior of a common converging lens for the input of tilted waves,a recent publication suggests a new optical element with an azimuthal-quadratic phase profile for the focusing of orbital angular mom...Analogous to the behavior of a common converging lens for the input of tilted waves,a recent publication suggests a new optical element with an azimuthal-quadratic phase profile for the focusing of orbital angular momentum beams at distinct angular positions.Its realization in a metasurface form enables the combined measurement of orbital and spin angular momentum using a single optical component.展开更多
文摘We present a method to efficiently multiply or divide the orbital angular momentum(OAM)of light beams using a sequence of two optical elements.The key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector.By combining multiple circular-sector transformations into a single optical element,it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular sectors.Conversely,by combining multiple inverse transformations,the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase gradients.Optical elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography.Optical tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM,whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM beams.These elements can find applications for the multiplicative generation of higher-order OAM modes,optical information processing based on OAM beam transmission,and optical routing/switching in telecom.
文摘The detection of orbital angular momentum usually relies on optical techniques,which modify the original beam to convert the information carried on its phase into a specific intensity distribution in output.Moreover,the exploitation of high-intensity beams can result destructive for standard optical elements and setups.A recent publication suggests a solution to overcome all those limitations,by probing highly-intense vortex pulses with a structured reference beam in a strong-field photoionization process.
文摘Analogous to the behavior of a common converging lens for the input of tilted waves,a recent publication suggests a new optical element with an azimuthal-quadratic phase profile for the focusing of orbital angular momentum beams at distinct angular positions.Its realization in a metasurface form enables the combined measurement of orbital and spin angular momentum using a single optical component.
