Dear Dmitriy,

The attached review describes the equations for calculating a frequency dependent dielectric matrix in terahertz regime.

PHYSICAL REVIEW E 75, 036614 2007

Terahertz plasmonic composites

Syrus C. Nemat-Nasser,1,* Alireza V. Amirkhizi,1 Willie J. Padilla,2,† Dimitri N. Basov,2 Sia Nemat-Nasser,1,‡

Derek Bruzewicz,3 and George Whitesides3

1

Center of Excellence for Advanced Materials, Department of Mechanical and Aerospace Engineering, University of California,

San Diego, Mail code: 0416, 9500 Gilman Drive, La Jolla, California 92093-0416, USA 2

Department of Physics, University of California, San Diego, Mail code: 0416, 9500 Gilman Drive, La Jolla,

California 92093-0416, USA 3

Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA

Received 27 October 2006; revised manuscript received 20 December 2006; published 27 March 2007

The dielectric response of a polymer matrix composite can be substantially modified and tuned within a broad frequency band by integrating within the material an artificial plasmon medium composed of periodically distributed, very thin, electrically conducting wires. In the microwave regime, such plasmon/polymer

composites have been studied analytically, computationally, and experimentally. This work reports the design, fabrication, and characterization of similar composites for operation at terahertz frequencies. Such composites require significant reduction in the thickness and spacing of the wires. We used numerical modeling to design

artificial effective plasmonic media with turn-on frequencies in the terahertz range. Prototype samples were produced by lithographically embedding very thin gold strips into a PDMS polydimethylsiloxane matrix.

These samples were characterized with a Fourier-transform infrared interferometer using the frequencydependent transmission and Kramers-Kronig relations to determine the electromagnetic properties. We report the characterization results for a sample, demonstrating excellent agreement between theory, computer design,

and experiment. To our knowledge this is the first demonstration of the possibility of creating composites with tuned dielectric response at terahertz frequencies.

Hoping this will be helpful,

Rafik

Dear Dmitriy,

The attached review describes the equations for calculating a frequency dependent dielectric matrix in terahertz regime.

PHYSICAL REVIEW E 75, 036614 2007

Terahertz plasmonic composites

Syrus C. Nemat-Nasser,1,* Alireza V. Amirkhizi,1 Willie J. Padilla,2,† Dimitri N. Basov,2 Sia Nemat-Nasser,1,‡

Derek Bruzewicz,3 and George Whitesides3

1

Center of Excellence for Advanced Materials, Department of Mechanical and Aerospace Engineering, University of California,

San Diego, Mail code: 0416, 9500 Gilman Drive, La Jolla, California 92093-0416, USA 2

Department of Physics, University of California, San Diego, Mail code: 0416, 9500 Gilman Drive, La Jolla,

California 92093-0416, USA 3

Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA

Received 27 October 2006; revised manuscript received 20 December 2006; published 27 March 2007

The dielectric response of a polymer matrix composite can be substantially modified and tuned within a broad frequency band by integrating within the material an artificial plasmon medium composed of periodically distributed, very thin, electrically conducting wires. In the microwave regime, such plasmon/polymer

composites have been studied analytically, computationally, and experimentally. This work reports the design, fabrication, and characterization of similar composites for operation at terahertz frequencies. Such composites require significant reduction in the thickness and spacing of the wires. We used numerical modeling to design

artificial effective plasmonic media with turn-on frequencies in the terahertz range. Prototype samples were produced by lithographically embedding very thin gold strips into a PDMS polydimethylsiloxane matrix.

These samples were characterized with a Fourier-transform infrared interferometer using the frequencydependent transmission and Kramers-Kronig relations to determine the electromagnetic properties. We report the characterization results for a sample, demonstrating excellent agreement between theory, computer design,

and experiment. To our knowledge this is the first demonstration of the possibility of creating composites with tuned dielectric response at terahertz frequencies.

Hoping this will be helpful,

Rafik

Dear Rafik,

Thank you very much for the paper. I'll read it.

Hello,

I hope U got the solution for the problem. I would like to give some suggestions.

We can calculate  frequency dependent dielectic matrix using VASP by enabling 

LOPTICS = .TRUE.

ALGO = CHI

For supercell of 7x7x1 KPOINTS,

NKREDX = 7; NKREDY = 7' NKREDZ = 1. 

If U have any idea or suggestions pls, tell me