Generation of a radially polarized light beam using space-variant subwavelength gratings at 1064 nm
2008; Optica Publishing Group; Volume: 33; Issue: 23 Linguagem: Inglês
10.1364/ol.33.002782
ISSN1539-4794
Autores Tópico(s)Near-Field Optical Microscopy
ResumoThe generation of radially polarized beams at a wavelength of 1064 nm by the use of a polarization transformer device consisting of space-variant subwavelength gratings (SGs) is demonstrated experimentally. The SG generates a pi phase retardation between the TE and TM polarizations, acting as a half-wave plate, reflecting the polarization vector with respect to the axes of the plate. The polarization transformer is characterized by polarization analysis and by far-field measurements. The characterization results show good agreement with theory. The device is suitable for operation with Nd:YAG lasers; thus it is attractive for biological, optical tweezers, and material processing applications.
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