Abstract
As a kind of special beams, Bessel beams are always a research hot spot in optics due to its non-diffractive and self-healing properties. Here, zero-order terahertz (THz) Bessel beams with linear and circular polarizations are generated by using a THz quarter wave plate and Teflon axicons with different opening angles. By applying a THz digital holographic imaging system, the evolutions of the transverse (Ex, Ey) and longitudinal (Ez) electric fields are coherently measured and analyzed during the propagation processes of the THz Bessel beams. The vectorial Rayleigh diffraction integral is used to accurately reproduce the amplitude, phase, and non-diffractive feature of each polarization component for the THz Bessel beams. With varying opening angles of the axicons, the focal spots, diffraction-free ranges, and Gouy phase shifts of the THz Bessel beams are compared and discussed. The experiment and simulation results provide a comprehensive view for exactly understanding peculiar features of THz Bessel beams.
Highlights
The concept of a non-diffractive Bessel beam was firstly proposed by Durnin et al in 19871
Zero-order THz Bessel beams with linear and circular polarizations are generated by employing Teflon axicons with different opening angles and a THz quarter wave plate (TQWP)
Vectorial properties of the THz Bessel beams are comprehensively observed by using a THz digital holographic imaging system, including the transverse (Ex, Ey) and longitudinal (Ez) electric field components
Summary
The concept of a non-diffractive Bessel beam was firstly proposed by Durnin et al in 19871. Zero-order THz Bessel beams with linear and circular polarizations are generated by employing Teflon axicons with different opening angles and a THz quarter wave plate (TQWP). Vectorial properties of the THz Bessel beams are comprehensively observed by using a THz digital holographic imaging system, including the transverse (Ex, Ey) and longitudinal (Ez) electric field components. An x-polarized THz wave gets into a Teflon axicon to generate a zero-order THz Bessel beam.
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