Abstract-Experimental demonstration of terahertz metamaterial absorbers with a broad and flat high absorption band

Li Huang, Dibakar Roy Chowdhury, Suchitra Ramani, Matthew T. Reiten, Sheng-Nian Luo, Antoinette J. Taylor, and Hou-Tong Chen
https://www.osapublishing.org/ol/abstract.cfm?URI=ol-37-2-154

We present the design, numerical simulations and experimental measurements of terahertz metamaterial absorbers with a broad and flat absorption top over a wide incidence angle range for either transverse electric or transverse magnetic polarization depending on the incident direction. The metamaterial absorber unit cell consists of two sets of structures resonating at different but close frequencies. The overall absorption spectrum is the superposition of individual components and becomes flat at the top over a significant bandwidth. The experimental results are in excellent agreement with numerical simulations.

© 2012 Optical Society of America

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Abstract-Applications of Optically Generated Terahertz Pulses to Time Domain Ranging and Scattering

R. Alan Cheville, 

Matthew T. Reiten, 

Roger McGowan, 

Daniel R. Grischkowsky

http://link.springer.com/chapter/10.1007%2F978-3-540-45601-8_6

This chapter focuses on the use of THz time-domain techniques for the measurement of time-resolved electromagnetic scattering. Electromagnetic scattering is a vast field owing to its application in a wide range of measurement techniques in addition to commercial and military radar. The vast majority of treatments look at scattering in the frequency domain. Owing to the high bandwidth, the phase coherence, and our ability to directly measure the electromagnetic field with subpicosecond resolution, optically generated THzbandwidth pulses provide a valuable new method to investigate fundamental scattering mechanisms. This introductory section provides a brief background on electromagnetic scattering, and attempts to provide a perspective on the application of THz time-domain techniques in this broad field.

Abstract-Terahertz metamaterials for linear polarization conversion and anomalous refraction

Nathaniel K. Grady, Jane E. Heyes, Dibakar Roy Chowdhury, Yong Zeng, Matthew T. Reiten, Abul K. Azad, Antoinette J. Taylor, Diego A. R. Dalvit, Hou-Tong Chen
Polarization is one of the basic properties of electromagnetic waves conveying valuable information in signal transmission and sensitive measurements. Conventional methods for advanced polarization control impose demanding requirements on material properties and attain only limited performance. Here, we demonstrate ultrathin, broadband, and highly efficient metamaterial-based terahertz polarization converters that are capable of rotating a linear polarization state into its orthogonal one. Based on these results we create metamaterial structures capable of realizing near-perfect anomalous refraction. Our work opens new opportunities for creating high performance photonic devices and enables emergent metamaterial functionalities for applications in the technologically difficult terahertz frequency regime.

Abstract-Terahertz Metamaterials for Linear Polarization Conversion and Anomalous Refraction

1. 
   

1. Nathaniel K. Grady¹, 
2. Jane E. Heyes¹, 
3. Dibakar Roy Chowdhury¹, 
4. Yong Zeng², 
5. Matthew T. Reiten¹, 
6. Abul K. Azad¹,
7. Antoinette J. Taylor¹, 
8. Diego A. R. Dalvit², 
9. Hou-Tong Chen¹,*

+Author Affiliations

http://www.sciencemag.org/content/early/2013/05/15/science.1235399.abstract
Polarization is one of the basic properties of electromagnetic waves conveying valuable information in signal transmission and sensitive measurements. Conventional methods for advanced polarization control impose demanding requirements on material properties and attain only limited performance. Here, we demonstrate ultrathin, broadband, and highly efficient metamaterial-based terahertz polarization converters that are capable of rotating a linear polarization state into its orthogonal one. Based on these results, we create metamaterial structures capable of realizing near-perfect anomalous refraction. Our work opens new opportunities for creating high-performance photonic devices and enables emergent metamaterial functionalities for applications in the technologically difficult terahertz frequency regime.