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Optical orbital angular momentum conservation during the transfer process from plasmonic vortex lens to light.

Yu H, Zhang H, Wang Y, Han S, Yang H, Xu X, Wang Z, Petrov V, Wang J - Sci Rep (2013)

Bottom Line: We demonstrate the optical orbital angular momentum conservation during the transfer process from subwavelength plasmonic vortex lens (PVLs) to light and the generating process of surface plasmon polaritons (SPPs).The angular momentum of twisting SP electromagnetic field is tunable by the twisted metal/dielectric interfaces of PVLs and angular momentum of illuminating singular light.This work may open the door for several possible applications of SP vortices in subwavelength region.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China.

ABSTRACT
We demonstrate the optical orbital angular momentum conservation during the transfer process from subwavelength plasmonic vortex lens (PVLs) to light and the generating process of surface plasmon polaritons (SPPs). Illuminating plasmonic vortex lenses with beams carrying optical orbital angular momentum, the SP vortices with orbital angular momentum were generated and inherit the optical angular momentum of light beams and PVLs. The angular momentum of twisting SP electromagnetic field is tunable by the twisted metal/dielectric interfaces of PVLs and angular momentum of illuminating singular light. This work may open the door for several possible applications of SP vortices in subwavelength region.

No MeSH data available.


Related in: MedlinePlus

Experimental patterns and theoretical analysis of the SP vortices.(a)–(c) Experimental patterns of SP vortices using a linearly polarized LG00 mode and PVL with m = −4, −7 and −10, respectively. (d)–(f) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a)–(c), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective  functions shown in eq.(2) with n = −4, −7 and −10 and the adjusted size of the pattern.
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f2: Experimental patterns and theoretical analysis of the SP vortices.(a)–(c) Experimental patterns of SP vortices using a linearly polarized LG00 mode and PVL with m = −4, −7 and −10, respectively. (d)–(f) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a)–(c), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective functions shown in eq.(2) with n = −4, −7 and −10 and the adjusted size of the pattern.

Mentions: The laser patterns with Laguerre-Gaussian (LG0,l) modes with = 0, 1, and 2 and unknown chirality were obtained by tuning the pump power of the laser diode27. The laser wavelength of 1.08 μm corresponded to a SP vortex wavelength of 1.06 μm as shown above. Focusing the laser beam on the surfaces of the PVLs as shown in Fig. 1, the SP vortices can be acquired. The patterns of SP vortices obtained with LG00 mode and right-handed rotated PVLs with the geometric topological charge m of −4, −7 and −10 are shown in Fig. 2 (a), (b) and (c). The intensity distribution of cross sections (red line) through the centers of obtained SP patterns are presented in Fig. 2 (d), (e) and (f). The theoretical intensity distribution equals to defined in eq. 2 shown in the Discussion part and is also shown in (d), (e) and (f) (black line) of Fig. 2 with order and topological charge of n = −4, −7 and −10. Since the peaks near the centers are much stronger than the outside ones26 and the relative position of peaks is determined by the orders of Bessel and Laguerre-Gaussian functions, we can find that in these figures, the relative position of experimental and theoretical peaks near the centers agrees well in principle, and by which we can determine the order of the Bessel functions and the orbital angular momentum per photon of SP vortices. The discrepancies may be generated by the imperfection of the PVLs, the dispersion of the focal lens and the sensitivity of the CCD.


Optical orbital angular momentum conservation during the transfer process from plasmonic vortex lens to light.

Yu H, Zhang H, Wang Y, Han S, Yang H, Xu X, Wang Z, Petrov V, Wang J - Sci Rep (2013)

Experimental patterns and theoretical analysis of the SP vortices.(a)–(c) Experimental patterns of SP vortices using a linearly polarized LG00 mode and PVL with m = −4, −7 and −10, respectively. (d)–(f) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a)–(c), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective  functions shown in eq.(2) with n = −4, −7 and −10 and the adjusted size of the pattern.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3824164&req=5

f2: Experimental patterns and theoretical analysis of the SP vortices.(a)–(c) Experimental patterns of SP vortices using a linearly polarized LG00 mode and PVL with m = −4, −7 and −10, respectively. (d)–(f) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a)–(c), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective functions shown in eq.(2) with n = −4, −7 and −10 and the adjusted size of the pattern.
Mentions: The laser patterns with Laguerre-Gaussian (LG0,l) modes with = 0, 1, and 2 and unknown chirality were obtained by tuning the pump power of the laser diode27. The laser wavelength of 1.08 μm corresponded to a SP vortex wavelength of 1.06 μm as shown above. Focusing the laser beam on the surfaces of the PVLs as shown in Fig. 1, the SP vortices can be acquired. The patterns of SP vortices obtained with LG00 mode and right-handed rotated PVLs with the geometric topological charge m of −4, −7 and −10 are shown in Fig. 2 (a), (b) and (c). The intensity distribution of cross sections (red line) through the centers of obtained SP patterns are presented in Fig. 2 (d), (e) and (f). The theoretical intensity distribution equals to defined in eq. 2 shown in the Discussion part and is also shown in (d), (e) and (f) (black line) of Fig. 2 with order and topological charge of n = −4, −7 and −10. Since the peaks near the centers are much stronger than the outside ones26 and the relative position of peaks is determined by the orders of Bessel and Laguerre-Gaussian functions, we can find that in these figures, the relative position of experimental and theoretical peaks near the centers agrees well in principle, and by which we can determine the order of the Bessel functions and the orbital angular momentum per photon of SP vortices. The discrepancies may be generated by the imperfection of the PVLs, the dispersion of the focal lens and the sensitivity of the CCD.

Bottom Line: We demonstrate the optical orbital angular momentum conservation during the transfer process from subwavelength plasmonic vortex lens (PVLs) to light and the generating process of surface plasmon polaritons (SPPs).The angular momentum of twisting SP electromagnetic field is tunable by the twisted metal/dielectric interfaces of PVLs and angular momentum of illuminating singular light.This work may open the door for several possible applications of SP vortices in subwavelength region.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China.

ABSTRACT
We demonstrate the optical orbital angular momentum conservation during the transfer process from subwavelength plasmonic vortex lens (PVLs) to light and the generating process of surface plasmon polaritons (SPPs). Illuminating plasmonic vortex lenses with beams carrying optical orbital angular momentum, the SP vortices with orbital angular momentum were generated and inherit the optical angular momentum of light beams and PVLs. The angular momentum of twisting SP electromagnetic field is tunable by the twisted metal/dielectric interfaces of PVLs and angular momentum of illuminating singular light. This work may open the door for several possible applications of SP vortices in subwavelength region.

No MeSH data available.


Related in: MedlinePlus