Gold Nanoparticle Channels Transmit Energy Through Dark Plasmons

A research team led by Stephan Link from Rice University has demonstrated that tiny channels of gold nanoparticles are capable of transmitting electromagnetic energy that begins as light and transmits through ‘dark plasmans.’

Members of the lab of Rice Professor Stephan Link – from left, research associate Wei-Shun Chang and graduate students David Solis Jr. and Britain Willingham – created thin strips of gold nanoparticles to study their ability to carry electromagnetic signals via dark plasmons. (Credit: Jeff Fitlow/Rice University)

The research team also demonstrated that even disordered nanoparticles in arrays that have a thickness of 150 nm are capable of transmitting signals better than the results of earlier experiments, thus opening the door to advance optoelectronic devices.

In Stephan Link’s laboratory, the research team has developed a technique to print thin lines of nanoparticles over glass substrate. It cut microscopic channels into a polymer over the glass substrate utilizing an electron beam to provide the shape to the nanoparticle lines. It then used capillary forces to deposit the gold nanoparticles into the channels. After washing away the remaining stray nanoparticles and the polymer, the team obtained the lines with particles that were at a distance of a few nanometers.

The resulting gold nanoparticle lines are capable of propagating a signal from one particle to the next one over several microns, a distance higher than earlier efforts and nearly comparable to results demonstrated utilizing gold nanowires.

Plasmons are electron waves capable of travelling through a metal surface when disturbed by an external electromagnetic source like light. Dark plasmons are not able to interact with light, as they do not have net dipole moment. Link explained that these modes are not completely dark, particularly in the existence of disorder. A tiny dipole oscillation exists even for the subradiant modes and when these are coupled, cause minimal scattering loss and sustain plasmon transmission over longer distances.

To measure the distance, the research team used a fluorescent dye to coat the 15-micron-long gold nanoparticle lines and then measured the propagation distance of the plasmons that are excited by a laser, using a photobleaching technique.

According to Link, silver nanowires are better plasmon wave carriers when compared to gold counterpart. The team knows that it may transmit a lot longer if it uses silver nanoparticles and it will hopefully do that in more intricate structures. These silver nanoparticles can be coupled to other components like nanowires in structures that would not be achievable otherwise, Link concluded.

Source: http://www.rice.edu

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Choi, Andy. (2019, February 28). Gold Nanoparticle Channels Transmit Energy Through Dark Plasmons. AZoOptics. Retrieved on April 23, 2024 from https://www.azooptics.com/News.aspx?newsID=15083.

  • MLA

    Choi, Andy. "Gold Nanoparticle Channels Transmit Energy Through Dark Plasmons". AZoOptics. 23 April 2024. <https://www.azooptics.com/News.aspx?newsID=15083>.

  • Chicago

    Choi, Andy. "Gold Nanoparticle Channels Transmit Energy Through Dark Plasmons". AZoOptics. https://www.azooptics.com/News.aspx?newsID=15083. (accessed April 23, 2024).

  • Harvard

    Choi, Andy. 2019. Gold Nanoparticle Channels Transmit Energy Through Dark Plasmons. AZoOptics, viewed 23 April 2024, https://www.azooptics.com/News.aspx?newsID=15083.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.