Optimum Optical Designs for Diffraction-Limited Terahertz Spectroscopy and Imaging Systems Using Off-Axis Parabolic Mirrors
Optimum Optical Designs for Diffraction-Limited Terahertz Spectroscopy and Imaging Systems Using Off-Axis Parabolic Mirrors
复制标题
使用离轴抛物面镜的衍射限制太赫兹光谱和成像系统的最佳光学设计
DOI:
10.1007/s10762-023-00949-8
复制
发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Chopra N
中科院分区:
文献类型:
--
作者:
Chopra N
Off-axis parabolic mirrors (OAPMs) are widely used in the THz and mm-wave communities for spectroscopy and imaging applications, as a result of their broadband, low-loss operation and high numerical apertures. However, the aspherical shape of an OAPM creates significant geometric aberrations: these make achieving diffraction-limited performance a challenge, and lower the peak electric field strength in the focal plane. Here, we quantify the impact of geometric aberrations on the performance of the most widely used spectrometer designs, by using ray tracing and physical optics calculations to investigate whether diffraction-limited performance can be achieved in both the sample and the detector plane. We identify simple rules, based on marginal ray propagation, that allow spectrometers to be designed that are more robust to misalignment errors, and which have minimal aberrations for THz beams. For a given source, this allows the design of optical paths that give the smallest THz beam focal spot, with the highest THz electric field strength possible. This is desirable for improved THz imaging, for better signal-to-noise ratios in linear THz spectroscopy and optical-pump THz-probe spectroscopy, and to achieve higher electric field strengths in non-linear THz spectroscopy.
登录
查看更多内容
DOI:
10.1063/5.0046664
发表时间:
2021-03
期刊:
The Journal of chemical physics
影响因子:
--
作者:
K. Reimann;M. Woerner;T. Elsaesser
通讯作者:
K. Reimann;M. Woerner;T. Elsaesser
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
C. Jördens;M. Salhi;T. Hasek;G. Thorwirth;U. Böttger;M. Koch
通讯作者:
M. Koch
DOI:
--
发表时间:
2014
期刊:
International Conference on Infrared, Millimeter, and Terahertz Waves
影响因子:
--
作者:
S. Sung;J. Garritano;N. Bajwa;B. Nowroozi;W. Grundfest;Z. Taylor
通讯作者:
Z. Taylor
影响因子:
3.1
作者:
C. Brückner;G. Notni;A. Tünnermann
通讯作者:
A. Tünnermann
影响因子:
3.8
作者:
J. Deveikis;J. Lloyd‐Hughes
通讯作者:
J. Lloyd‐Hughes