The Magic of Optics-An Overview of Recent Advanced Terahertz Diffractive Optical Elements

Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures bas...

Full description

Saved in:
Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-12, Vol.21 (1), p.100
Main Author: Siemion, Agnieszka
Format: Article
Language:English
Subjects:
3-D printers
3D printing
Arrays
Attenuation
beam shaping
Broadband
convolution approach
Design
Design optimization
Diffractive optical elements
Fluorides
High density polyethylenes
Incident radiation
Manufacturing
on-axis and off-axis regime
Optical components
Optics
Polyethylene
Refractive lenses
Review
Spectrum analysis
terahertz optics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Diffractive optical elements are well known for being not only flat but also lightweight, and are characterised by low attenuation. In different spectral ranges, they provide better efficiency than commonly used refractive lenses. An overview of the recently invented terahertz optical structures based on diffraction design is presented. The basic concepts of structure design together with various functioning of such elements are described. The methods for structure optimization are analysed and the new approach of using neural network is shown. The paper illustrates the variety of structures created by diffractive design and highlights optimization methods. Each structure has a particular complex transmittance that corresponds to the designed phase map. This precise control over the incident radiation phase changes is limited to the design wavelength. However, there are many ways to overcome this inconvenience allowing for broadband functioning.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21010100