Nav: Home

Narrow plasmonic surface lattice resonances prefer asymmetric dielectric environment

September 03, 2019

Plasmonic nanostructures have been widely used for enhancing light-matter interactions due to the strong local field enhancement in deep subwavelength volumes.

Localized surface plasmon resonances (LSPRs) and propagating surface plasmon resonances (SPR) both suffer from low quality factors and limited field enhancements, resulting in restricted performance in applications. By patterning metal nanoparticles in arrays, plasmonic surface lattice resonances (SLRs) can have lower radiation loss, higher quality factors, and larger field enhancements over large volumes.

A research group led by Dr. LI Guangyuan and Dr. LU Yuanfu from the Shenzhen Institutes of Advanced Technology (SIAT) of the Chinese Academy of Sciences reported a novel type of SLR based on metal-insulator-metal (MIM) arrays. The paper, entitled "Narrow plasmonic surface lattice resonances with preference to asymmetric dielectric environment," was published on Sep. 2 in Optics Express and was highlighted as an Editor's Pick.

Conventional SLRs are supported mainly by periodic metal nanoparticles and require a symmetric dielectric environment, that is, the superstrate and the substrate should have the same refractive index. If the dielectric environment becomes less symmetric, SLR performance deteriorates dramatically. This greatly hinders the practical applications of SLRs especially in optofluidic sensors, where it is difficult to match the refractive index of the substrate with water or other fluids.

In this work, the researchers proposed a new SLR supported by a periodic MIM array and with a higher quality factor in a less symmetric dielectric environment. They showed that when the dielectric environment was as asymmetric as the air/glass environment, the proposed SLRhad a high quality factor of 62 under normal incidence and 147 under oblique incidence in the visible regime, or several times the highest quality factors of conventional SLRs under the same conditions.

They also illustrated that an opto-microfluid sensing platform based on the proposed SLR under normal incidence (without optimization) had a sensitivity of 316 nm/RIU and a figure of merit (FOM) of 25. This FOM is much larger than that of conventional LSPR, SPR or SLR sensors.

The researchers believe that the SLR they have proposed, featuring higher quality factors in a less symmetric environment, is appealing for diverse applications, including nanolasers, nonlinear optics, ultrasensitive sensing, and modulators.
-end-


Chinese Academy of Sciences Headquarters

Related Optics Articles:

Using fiber optics to advance safe and renewable energy
Fiber optic cables, it turns out, can be incredibly useful scientific sensors.
Machine learning implemented for quantum optics by Skoltech scientists
As machine learning continues to surpass human performance in a growing number of tasks, scientists at Skoltech have applied deep learning to reconstruct quantum properties of optical systems.
Biomimetic optics: Effective substitute for eyes
Scientists at University of Tyumen (UTMN) have presented a large-scale study of biomimetic optics, liquid elements that effectively imitate eye functions for use in various fields of industry and medicine, as well as in biochemical and biometric analysis.
Russian scientists have found a way to make laser optics more effective and cheaper
The research team of the IKBFU developed a fundamentally new method of manufacturing laser optics, which is based on the use of rare-earth metal ions of ytterbium and its oxide.
The physical limit of quantum optics resolves a mystery of computational complexity
Recently, Prof. Man-Hong Yung, associate professor of SUSTech and his colleagues published a paper 'Universal bound on sampling bosons in linear optics and its computational implications' in National Science Review (NSR), offering a complete solution to the open problem posed by Prof.
Next-generation optics in just two minutes of cooking time
One of the key building blocks of flexible photonic circuits and ultra-thin optics are metasurfaces.
Physicists discover new way of resonance tuning for nonlinear optics
A research team from ITMO University and the Australian National University has discovered that different metasurfaces exhibit the same behavior provided a symmetry breaking is introduced to their unit cells 'meta-atoms'.
Novel optics for ultrafast cameras create new possibilities for imaging
Researchers from the Camera Culture Group at the MIT Media Lab have reinvented photography optics to capture images based on the timing of reflecting light inside the optics, which opens doors to new capabilities for ultrafast time- or depth-sensitive cameras.
Scientists reduced the weight of optics for satellite observation by 100 times
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (IEEE) published the article of the group of scientists of Samara National Research University.
Supersharp images from new VLT adaptive optics
ESO's Very Large Telescope (VLT) has achieved first light with a new adaptive optics mode called laser tomography -- and has captured remarkably sharp test images of the planet Neptune and other objects.
More Optics News and Optics Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Teaching For Better Humans 2.0
More than test scores or good grades–what do kids need for the future? This hour, TED speakers explore how to help children grow into better humans, both during and after this time of crisis. Guests include educators Richard Culatta and Liz Kleinrock, psychologist Thomas Curran, and writer Jacqueline Woodson.
Now Playing: Science for the People

#556 The Power of Friendship
It's 2020 and times are tough. Maybe some of us are learning about social distancing the hard way. Maybe we just are all a little anxious. No matter what, we could probably use a friend. But what is a friend, exactly? And why do we need them so much? This week host Bethany Brookshire speaks with Lydia Denworth, author of the new book "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond". This episode is hosted by Bethany Brookshire, science writer from Science News.
Now Playing: Radiolab

Space
One of the most consistent questions we get at the show is from parents who want to know which episodes are kid-friendly and which aren't. So today, we're releasing a separate feed, Radiolab for Kids. To kick it off, we're rerunning an all-time favorite episode: Space. In the 60's, space exploration was an American obsession. This hour, we chart the path from romance to increasing cynicism. We begin with Ann Druyan, widow of Carl Sagan, with a story about the Voyager expedition, true love, and a golden record that travels through space. And astrophysicist Neil de Grasse Tyson explains the Coepernican Principle, and just how insignificant we are. Support Radiolab today at Radiolab.org/donate.