customized fiber generates bessel beams
Illustration of the KAUST team’s custom-engineered optical fiber, known as a Bessel beam, which they fabricated using a technique called two-photon lithography. Credit: KAUST; Andrea Bertoncini

An all fiber-based approach to generating special optical beams, called Bessel beams, could open up new applications in imaging, optical trapping and communications.

Bessel beams look quite different from the usual Gaussian light beams found in optics. In particular, they possess several interesting properties including self-healing, diffraction-free propagation and the ability to carry orbital angular momentum (OAM). This family of beams—also known as vortex beams with a characteristic ring-like shape and a dark central region—include different “orders” of beams carrying different values of OAM.

However, the creation of Bessel beams is somewhat inconvenient: several bulk optical elements, such as spatial light modulators or cone-shaped axicons, are needed to convert Gaussian beams to Bessel beams.

Now, Innem Reddy, Andrea Bertoncini and Carlo Liberale from KAUST have experimentally demonstrated that a custom-engineered optical fiber can do the job and generate a particular Bessel beam on demand. They have published their results in Optica.

“Generating Bessel beams using traditional techniques involves space-consuming, expensive optical elements that require precise alignment,” explains Reddy, a Ph.D. student in the group. “By opting for a fiber-based solution, we can obtain a compact Bessel beam generator that is pre-aligned and can deliver these beams even in remote and confined spaces, such as endoscopic applications.”

“In particular, the fiber-based generation of Bessel beams allows innovative applications, such as minimally invasive endoscopic probes, optical coherence tomography, fiber-based optical trapping and manipulation of microscopic particles.”

The team’s fiber is a masterpiece of custom engineering. They use a technique called two-photon lithography (TPL), which enables 3D printing of intricate optical structures to fabricate special beam-shaping elements directly onto the tip of a single-mode optical fiber. Their design has three segments that, collectively, efficiently align and transform a conventional Gaussian beam into an annular beam and then, finally, a Bessel beam of the desired order and OAM value.

The work is the latest triumph in a research program that intends to leverage the potential of the TPL technique, where light is used to “write” fine optical structures by solidifying a photoresist.

The team has already used TPL to customize fibers in other ways, including the creation of polarization beam splitters, microlens assemblies and optical tweezers. “Fabricating ever more sophisticated optical devices on the end of optical fibers to empower them to deliver complex functionalities is one of the main research directions of our group,” says Liberale. More information: Innem V. A. K. Reddy et al, 3D-printed fiber-based zeroth- and high-order Bessel beam generator, Optica (2022). DOI: 10.1364/OPTICA.453839 Journal information: Optica

Provided by King Abdullah University of Science and Technology Citation: Customized fiber generates Bessel beams (2022, August 9) retrieved 9 August 2022 from https://phys.org/news/2022-08-customized-fiber-bessel.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

TECH NEWS RELATED

Can understanding owners' behaviours improve the health and welfare of horses?

Credit: CC0 Public Domain An editorial introducing a special virtual issue of the Equine Veterinary Journal turns the lens on horse owners. The editorial introduces a collection of 20 studies examining horse owner behavior—such as recognizing colic, treating infectious diseases, vaccinating against various pathogens, and following veterinary advice—and how ...

View more: Can understanding owners' behaviours improve the health and welfare of horses?

How do female CEOs affect corporate environmental policies?

Credit: Pixabay/CC0 Public Domain In a Corporate Social Responsibility and Environmental Management analysis of 351 Chinese listed firms in heavily polluting industries from 2006–2019, investigators found that companies with female CEOs tended to have policies supporting environmental sustainability—for example, reducing waste, minimizing consumption, and protecting and conserving wildlife and ...

View more: How do female CEOs affect corporate environmental policies?

Should developing countries invest more in agriculture or education?

Credit: Unsplash/CC0 Public Domain A study in the Review of Development Economics examines whether a typical developing country should invest more in agriculture or education, and at what stage of development it’s optimal to invest more in each of these sectors. The author, Maxwell Mkondiwa, Ph.D., a Spatial Economist ...

View more: Should developing countries invest more in agriculture or education?

Nigerian government sues Meta for illegal ads – seeks $70 million

Multinational companies like Meta usually face a lot of issues in different countries every year. For Meta, the company appears to make a lot of decisions that come back to haunt the company. These decisions and actions are leading to lawsuits upon lawsuits in different parts of the world. The ...

View more: Nigerian government sues Meta for illegal ads – seeks $70 million

Foxconn, FPG keen on LFP battery production in Taiwan

Lithium iron phosphate (LFP) batteries are significantly gaining ground in energy storage and EV applications amid the mounting calls for reducing carbon emissions to net zero. This has prompted many industry conglomerates including Taiwan’s Formosa Plastics Group (FPG) and Foxconn Technology (Hon Hai) to step up investments in domestic ...

View more: Foxconn, FPG keen on LFP battery production in Taiwan

US-based online retailer Poshmark will delist from public markets: CEO Manish Chandra

ETtech He also clarified that Poshmark will continue to operate independently, as a standalone subsidiary of Naver, and that their current management team, brand, mission will remain the same A day after US online apparel resale platform Poshmark was acquired by South Korean tech firm Naver Corp, Poshmark chief executive ...

View more: US-based online retailer Poshmark will delist from public markets: CEO Manish Chandra

IPO-bound Oyo valuation dips in pvt market after reported markdown by investor SoftBank

AgenciesValuation of IPO-bound Oyo in the private market has dipped to around USD 6.5 billion following reports of a markdown of valuation of the hospitality and travel-tech firm by SoftBank in its private books, according to industry players. In the week ended September 30, 2022, nearly 12.3 lakh shares of ...

View more: IPO-bound Oyo valuation dips in pvt market after reported markdown by investor SoftBank

Robotics startup Miko acquires 70% stake in Square Off, eyes $100 million revenue by next year

Robotics startup Miko announced it has acquired a majority stake in Square Off, an AI-driven automated board games startup.Miko acquired a 70% stake in Square Off, giving an exit route to the existing investors. “With the acquisition, Miko will expand its product line beyond the AI robot companions that initially ...

View more: Robotics startup Miko acquires 70% stake in Square Off, eyes $100 million revenue by next year

Singapore's Carro launches assurance certification for used cars

Melting permafrost increases the emission of greenhouse gases in Arctic lakes

Optus Confirms Data Breach; 2.1 Million Government ID Numbers are Exposed

Spotlight on synthetic tissues and mRNA for chemistry Nobel

Report: Amazon freezes hiring on corporate retail division

Musk offers to close Twitter buyout deal at original price

Amid Ukraine war, US set to fly Russian cosmonaut to ISS

Nobel physics winner wanted to topple quantum theory he vindicated

Researchers examine the complex interactions between timber, logging, and forest elephants

You're a winner: Listening in on 'the call' for Nobel Prize

Nobel panel to announce winner of chemistry prize

Google Translate app no longer available in China

OTHER TECH NEWS

Top Car News Car News