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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 using a PVL with m = −4.(a) and (b) Experimental patterns using linearly polarized LG0,−1 and LG0,−2 modes and a PVL with m = −4. (c) and (d) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a) and (b), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective  functions shown in eq. (2) with n = −5 and −6 and the adjusted size of the pattern.
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f3: Experimental patterns and theoretical analysis of the SP vortices using a PVL with m = −4.(a) and (b) Experimental patterns using linearly polarized LG0,−1 and LG0,−2 modes and a PVL with m = −4. (c) and (d) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a) and (b), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective functions shown in eq. (2) with n = −5 and −6 and the adjusted size of the pattern.

Mentions: Increasing the pump power of the laser diode, light beams with LG0,l ( = 1 and 2) modes were achieved due to the increased nonlinearity including thermal focusing and Kerr effect in the gain medium which decreased the oscillating mode size in the cavity26. We found that compared to those shown in Fig. 2, the topological charges n of obtained SPPs increased by 1 or 2 depending on the topological charge of incident light beams. As representative results, the patterns with = 1 and 2, and m = −4 are shown in (a) and (b) of Fig. 3. The achieved experimental patterns and theoretical analysis of SP vortices with = 1 and 2, and n = −7 can be found in Supplementary Information. The intensity distribution of cross sections (red line) through the center is presented in the in (c) and (d) of this figure with topological charges of −5 and −6. From this figure, the total angular momentum per photon of SP vortices is . The results above also indicate that the chirality of the incident LG0,l modes is the same as the structure of the PVLs which is right-hand rotation and the signs of the topological charge of LG0,l modes should be minus ( or −2). Therefore, the total angular momentum per photon of the SP vortices can be described with and the total angular momentum is conserved.


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 using a PVL with m = −4.(a) and (b) Experimental patterns using linearly polarized LG0,−1 and LG0,−2 modes and a PVL with m = −4. (c) and (d) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a) and (b), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective  functions shown in eq. (2) with n = −5 and −6 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

f3: Experimental patterns and theoretical analysis of the SP vortices using a PVL with m = −4.(a) and (b) Experimental patterns using linearly polarized LG0,−1 and LG0,−2 modes and a PVL with m = −4. (c) and (d) Experimental data (red lines) of the intensity distribution through the centers of obtained SP vortex patterns corresponding the patterns (a) and (b), respectively, and the theoretical fitting (black lines) of experimental data (red lines) with respective functions shown in eq. (2) with n = −5 and −6 and the adjusted size of the pattern.
Mentions: Increasing the pump power of the laser diode, light beams with LG0,l ( = 1 and 2) modes were achieved due to the increased nonlinearity including thermal focusing and Kerr effect in the gain medium which decreased the oscillating mode size in the cavity26. We found that compared to those shown in Fig. 2, the topological charges n of obtained SPPs increased by 1 or 2 depending on the topological charge of incident light beams. As representative results, the patterns with = 1 and 2, and m = −4 are shown in (a) and (b) of Fig. 3. The achieved experimental patterns and theoretical analysis of SP vortices with = 1 and 2, and n = −7 can be found in Supplementary Information. The intensity distribution of cross sections (red line) through the center is presented in the in (c) and (d) of this figure with topological charges of −5 and −6. From this figure, the total angular momentum per photon of SP vortices is . The results above also indicate that the chirality of the incident LG0,l modes is the same as the structure of the PVLs which is right-hand rotation and the signs of the topological charge of LG0,l modes should be minus ( or −2). Therefore, the total angular momentum per photon of the SP vortices can be described with and the total angular momentum is conserved.

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