Nav: Home

O-FIB: Far-field-induced near-field breakdown for direct nanowriting in an atmospheric environment

March 19, 2020

Lasers are becoming one of the dominant tools in the current manufacturing industry. Much effort has been devoted to improving the processing accuracy, and spatial resolutions as low as micrometers have been achieved in laser cutting, wedding, marking and stereolithography in an atmospheric environment. The femtosecond laser (fs-laser) is a particularly promising approach from this point of view, in addition to its three-dimensional (3D) processing capability and broad-spectrum material usability. Super-diffraction-limited feature sizes at a level of tens of nanometers based on multiphoton absorption thresholding, shrinkage and stimulation emission depletion effects have also been realized in fs-laser induced photocuring of polymers, which unfortunately are not applicable to solid materials. Optical near-field techniques provide an alternative super-resolution scheme by localizing light fields to nanometer scales with the physical shapes of sharp tips, tiny apertures, nanoparticles and small protrusions. Nevertheless, these approaches often rely on heavy movement and alignment systems to maintain precise probe-substrate spacing for practical fabrication/patterning throughput due to the evanescent nature of the near field. An innovative optical patterning technology that permits vacuum-free high-resolution processing comparable to conventional FIB processing is highly desired.In a new paper published in Light Science & Application, scientists from the State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, China, the State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China, and the Nanotechnology facility, Swinburne University of Technology, John st., Hawthorn, Australia reported an optical far-field-induced near-field breakdown (O-FIB) approach, allowing the nanofabrication applicable to almost any solid materials in atmosphere. The writing is initiated from nano-holes created by femtosecond laser induced multiphoton absorption and its cutting "knife edge" is sharpened by far-field regulated enhancement of the optical near field. A spatial resolution of sub-20 nm (λ/40 for light wavelength λ) is readily achieved. O-FIB is empowered by a simple polarization control of the incident light for steering nano-groove writing along the designed pattern.

"According to the continuous boundary condition of the normal component of electric displacement, we experimentally observed the light field nano-localization and polarization-vertical enhancement around the nanohole, which permits direct control of the near-field enhancement for nanoablation by far field. Based on this idea, we have realized free nano-writing with resolution as high as 18 nm by manipulating laser polarization and beam's trajectory in real time."

"Since for the self-regulation effect induced by the feedback between light and the initial seeds, our approach has the inherent robustness against the stochastic nature of initial ablation and the ability to manipulate line width. Besides, our approach demonstrates free-form stitchless writing of nano-grooves with controllable length, separation and trajectory. Meanwhile, the universality of seeding effect enables a large-area printing mode which is superior to the conventional FIB."

"Our presented technique has opened a new era of high-efficient nanomachining. It is applicable for various materials and surface in the fields of nanoelectronics, nanofluids, and nanomedicines. The possibility we show here to direct manipulating the near field through the far field, may inspire the researchers to push the femtosecond laser nanofabrication or even other domains of the optical processing to a higher level." The scientists forecast.
-end-


Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

Related Laser Articles:

A laser for penetrating waves
The 'Landau-level laser' is an exciting concept for an unusual radiation source.
Laser light detects tumors
A team of researchers from Jena presents a groundbreaking new method for the rapid, gentle and reliable detection of tumors with laser light.
The first laser radio transmitter
For the first time, researchers at Harvard School of Engineering have used a laser as a radio transmitter and receiver, paving the way for towards ultra-high-speed Wi-Fi and new types of hybrid electronic-photonic devices.
The random anti-laser
Scientists at TU Wien have found a way to build the 'opposite' of a laser -- a device that absorbs a specific light wave perfectly.
Laser 'drill' sets a new world record in laser-driven electron acceleration
Combining a first laser pulse to heat up and 'drill' through a plasma, and another to accelerate electrons to incredibly high energies in just tens of centimeters, scientists have nearly doubled the previous record for laser-driven particle acceleration at Berkeley Lab's BELLA Center.
Laser physics: Transformation through light
Laser physicists have taken snapshots of how C60 carbon molecules react to extremely short pulses of intense infrared light.
Laser-induced graphene gets tough, with help
Laser-induced graphene created at Rice University combines with many materials to make tough, conductive composites for wearable electronics, anti-icing, antimicrobial applications, sensors and water treatment.
How molecules teeter in a laser field
When molecules interact with the oscillating field of a laser, an instantaneous, time-dependent dipole is induced.
Laser blasting antimatter into existence
Antimatter is an exotic material that vaporizes when it contacts regular matter.
New laser advances
Lasers are poised to take another step forward: Researchers at Case Western Reserve University, in collaboration with partners around the world, have been able to control the direction of a laser's output beam by applying external voltage.
More Laser News and Laser 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

Making Amends
What makes a true apology? What does it mean to make amends for past mistakes? This hour, TED speakers explore how repairing the wrongs of the past is the first step toward healing for the future. Guests include historian and preservationist Brent Leggs, law professor Martha Minow, librarian Dawn Wacek, and playwright V (formerly Eve Ensler).
Now Playing: Science for the People

#566 Is Your Gut Leaking?
This week we're busting the human gut wide open with Dr. Alessio Fasano from the Center for Celiac Research and Treatment at Massachusetts General Hospital. Join host Anika Hazra for our discussion separating fact from fiction on the controversial topic of leaky gut syndrome. We cover everything from what causes a leaky gut to interpreting the results of a gut microbiome test! Related links: Center for Celiac Research and Treatment website and their YouTube channel
Now Playing: Radiolab

The Flag and the Fury
How do you actually make change in the world? For 126 years, Mississippi has had the Confederate battle flag on their state flag, and they were the last state in the nation where that emblem remained "officially" flying.  A few days ago, that flag came down. A few days before that, it coming down would have seemed impossible. We dive into the story behind this de-flagging: a journey involving a clash of histories, designs, families, and even cheerleading. This show is a collaboration with OSM Audio. Kiese Laymon's memoir Heavy is here. And the Hospitality Flag webpage is here.