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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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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

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Published on: May 23, 2018

Tunable optical antennas enabled by the phase transition in vanadium dioxide.

Stuart K Earl, Timothy D James, Timothy J Davis

|November 13, 2013

Summary

Researchers dynamically tuned optical antenna resonances using vanadium dioxide (VO2) films. This temperature-driven modulation of silver nanoantenna arrays achieved significant wavelength shifts, enhancing plasmonic device potential.

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Area of Science:

Nanophotonics and Plasmonics
Materials Science
Metamaterials

Background:

Optical antennas are subwavelength metallic structures that resonate at visible frequencies.
Current applications span science, technology, and medicine, with potential for improved plasmonic device efficiencies.
Dynamic tuning of optical antenna resonances is crucial for expanding their applications.

Purpose of the Study:

To investigate the dynamic tuning of optical antenna resonances.
To explore the use of phase change materials for modulating antenna properties.
To assess the feasibility of temperature-induced wavelength modulation in nanoantenna arrays.

Main Methods:

Fabrication of silver nanoantenna arrays on thin films of vanadium dioxide (VO2).
Utilizing the phase transition of VO2 above its critical temperature (approx. 68 °C).
Modulating the resonant wavelength by controlling substrate temperature.

Main Results:

Successful modulation of the resonant wavelength of silver nanoantenna arrays.
Observed wavelength modulation up to 110 nm, dependent on the specific array design.
Demonstrated temperature-induced tuning of optical antenna resonances via VO2 phase transition.

Conclusions:

Phase change materials like VO2 offer a viable route for dynamically tuning optical antennas.
Temperature-controlled modulation of nanoantenna resonance is achievable.
This approach holds promise for enhancing plasmonic device performance and expanding applications.