TY - JOUR

T1 - Identification of the Hermite-Gaussian and Bessel modes of a terahertz beam with diffractive optical elements

AU - Осинцева , Наталья Дмитриевна

AU - Герасимов, Василий Валерьевич

AU - Чопорова, Юлия Юрьевна

AU - Кукотенко, Валерия Дмитриевна

AU - Павеляев, Владимир С.

AU - Князев, Борис Александрович

PY - 2024/4/1

Y1 - 2024/4/1

N2 - Subject of study. A technique for identifyingHermite-Gaussian and Bessel modes using diffractive optical elements is investigated in the terahertz range. The aim of the study is the development and testing of a method for identifying the mode composition of a terahertz radiation beam using binary phase diffractive optical elements for single- and multimode cases.Method. The proposed approach is based on the correlation filtering method. A beam with a high content of the mode under study was formed using the binary phase diffractive element, and then it illuminated the filter system consisting of a similar element and lens. If the forming and filtering elements were the same, a bright spot, the so-called positive response, was observed in the center of the image. Otherwise, radially symmetrically located petals with a dark spot in the center were observed, which corresponds to a negative response.Main results. The experimental results on the identification of Hermite-Gaussian modes [with numbers (1, 0) and (0, 1)] and Bessel modes (with topological charge modulus jlj=1, 2, 3, 4) in the case of the single-mode beam are introduced. For the case of the multimode beam, a combination of Bessel beams with topological charges -1 and -2 was formed. Practical significance.Wireless data transmission at terahertz frequencies (the target frequency range of 6G communications) using multimode Bessel beams will allow a significant increase in the data rate up to the order of Tbits/s. The method described in the paper can be used to decode the signals transmitted in a multimode beam.

AB - Subject of study. A technique for identifyingHermite-Gaussian and Bessel modes using diffractive optical elements is investigated in the terahertz range. The aim of the study is the development and testing of a method for identifying the mode composition of a terahertz radiation beam using binary phase diffractive optical elements for single- and multimode cases.Method. The proposed approach is based on the correlation filtering method. A beam with a high content of the mode under study was formed using the binary phase diffractive element, and then it illuminated the filter system consisting of a similar element and lens. If the forming and filtering elements were the same, a bright spot, the so-called positive response, was observed in the center of the image. Otherwise, radially symmetrically located petals with a dark spot in the center were observed, which corresponds to a negative response.Main results. The experimental results on the identification of Hermite-Gaussian modes [with numbers (1, 0) and (0, 1)] and Bessel modes (with topological charge modulus jlj=1, 2, 3, 4) in the case of the single-mode beam are introduced. For the case of the multimode beam, a combination of Bessel beams with topological charges -1 and -2 was formed. Practical significance.Wireless data transmission at terahertz frequencies (the target frequency range of 6G communications) using multimode Bessel beams will allow a significant increase in the data rate up to the order of Tbits/s. The method described in the paper can be used to decode the signals transmitted in a multimode beam.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85206449674&origin=inward&txGid=848a034e0ec2f28b6a67bb389510c647

M3 - Article

VL - 91

SP - 215

EP - 221

JO - Journal of Optical Technology (A Translation of Opticheskii Zhurnal)

JF - Journal of Optical Technology (A Translation of Opticheskii Zhurnal)

SN - 1070-9762

IS - 4

ER -