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The Antenna Complex

The Antenna Complex

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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Updated: Sep 30, 2025

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Published on: August 23, 2012

Nano-antenna array for high efficiency sunlight harvesting.

Michele Midrio, Luca Pierantoni, Stefano Boscolo

|March 18, 2022

Summary

This summary is machine-generated.

This study presents a novel solar rectenna design using an array of nano-antennas and a reflecting mirror. The proposed rectenna achieves over 70% efficiency across the solar spectrum, minimizing energy loss.

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Area of Science:

Nanotechnology
Renewable Energy
Electromagnetics

Background:

Solar rectennas are crucial for efficient light energy harvesting.
Accurate antenna efficiency calculation requires treating them as receiving devices.
Existing rectenna designs have limitations in efficiency and spectral range.

Purpose of the Study:

To propose a novel solar rectenna arrangement for enhanced energy harvesting efficiency.
To investigate the impact of sub-wavelength spacing, reflecting mirrors, and dual polarization on rectenna performance.
To achieve high polarization-insensitive efficiency over the entire solar spectrum.

Main Methods:

Numerical simulations were employed to analyze the proposed rectenna design.
An array of nano-antennas with sub-wavelength inter-element spacing was designed.
A reflecting mirror was incorporated to minimize back-scattering and enhance absorption.

Main Results:

The sub-wavelength lattice pitch ensured frequency flattening of lattice impedance, enabling excellent load matching.
The design demonstrated a smooth dependence of receiving efficiency on the angle of incidence.
A polarization-insensitive theoretical efficiency exceeding 70% was achieved across the 300-3000 nm spectral range.
Less than 10% energy loss due to back-scattering was observed.

Conclusions:

The proposed solar rectenna design significantly improves energy harvesting efficiency.
The novel arrangement overcomes limitations of previous designs, offering broad spectral response and polarization insensitivity.
This advancement holds promise for more effective solar energy conversion technologies.