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The Antenna Complex

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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...

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Related Experiment Video

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Photo-generated THz antennas.

G Georgiou¹, H K Tyagi¹, P Mulder²

¹Center for Nanophotonics, FOM Institute AMOLF, Science Park 102, 1098 XG, Amsterdam, The Netherlands.

Scientific Reports

|January 8, 2014

Summary

This summary is machine-generated.

Researchers created tunable terahertz (THz) antennas on semiconductors using light, avoiding physical fabrication. This all-optical method allows dynamic control over electromagnetic resonances and local fields on surfaces.

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Area of Science:

Terahertz (THz) photonics and plasmonics
Optoelectronics and semiconductor physics
Metamaterials and nanophotonics

Background:

Conducting structures exhibit electromagnetic resonances, enhancing local fields and extinction efficiencies.
Conventional fabrication methods fix antenna geometry, limiting resonant response tunability.
Controlling electromagnetic resonances typically requires physical structuring of materials.

Purpose of the Study:

To demonstrate a novel method for generating THz antennas on semiconductor surfaces.
To enable dynamic, all-optical control over antenna geometry and resonant properties.
To explore new possibilities for spatial control of surface electromagnetic phenomena.

Main Methods:

Photo-excitation of free charge carriers in a semiconductor layer using structured optical illumination.
Utilizing a spatial light modulator to precisely pattern the optical illumination.
Fabricating reconfigurable THz linear antennas on a flat semiconductor without physical structuring.

Main Results:

Successful photo-generation of THz linear antennas on a semiconductor surface.
Demonstration of reconfigurable antenna designs by altering the illumination pattern.
Achieved spatial control over THz electromagnetic resonances and local field enhancement.

Conclusions:

The all-optical approach offers a flexible alternative to traditional antenna fabrication.
This technique allows for dynamic spatial control of surface resonances and THz fields.
Opens avenues for reconfigurable optoelectronic devices and advanced THz applications.