---
title: "Glass Nerves of the Future: New HARFF Optical Fiber is 1,000 Times More Sensitive Than Standard Fiber"
description: "🔬 **Revolution in Sensing**: Scientists from Sweden and the UK have created flat HARFF optical fiber that is 1,000 times more sensitive than standard fiber. 📉 🧠 **How it works**: New geometry and micro-cavities with metals allow the fiber to \"feel\" pressure and temperature. 🚀 **Where it applies**: From monitoring the condition of bridges and aircraft to controlling battery safety and medicine. The main advantage is compatibility with standard equipment! #Science #Technology #OpticalFiber"
date: 2026-08-15T20:58:03.000Z
lang: en
url: https://xab.info/en/posts/glass-nerves-of-the-future-new-harff-optical-fiber-is-1000-times-more-sensitive
tags: [science, technology, optical-fiber, sensors, kth, innovation]
publisher: "XAB.info"
---

# Glass Nerves of the Future: New HARFF Optical Fiber is 1,000 Times More Sensitive Than Standard Fiber

![Scientist in blue gloves holding thin transparent HARFF optical fiber, demonstrating revolutionary sensitivity](https://xab.info/media/2026/08/16/steklo-nauchili-chuvstvovat-novoe-optovolokno-v-tisyachu-raz-chuvstvitelnee/steklo-nauchili-chuvstvovat-novoe-optovolokno-v-tisyachu-raz-chuvstvitelnee-1.webp)

## 🎯 Key Points

- The new HARFF optical fiber is 1,000 times more sensitive than traditional round fiber.
- The technology allows for the creation of pressure and temperature sensors without new equipment.
- Applications are possible in aviation, energy (batteries), and medicine.

A true revolution has occurred in the world of sensor technology, one that could fundamentally change the approach to monitoring the condition of critical infrastructure, aviation, and even medical systems. Researchers from the Royal Institute of Technology in Sweden (KTH), as well as the Universities of Southampton and Bristol in the UK, have presented an innovative platform called HARFF (High Aspect-Ratio Flat Fiber). This flat optical fiber not only transmits data but also acts as a hypersensitive sensor capable of "feeling" pressure and temperature with accuracy exceeding traditional technologies by a thousandfold.

### From Round to Flat: Geometry as the Key to Sensitivity

Traditional optical fiber, used for decades to transmit the internet and telephone signals, has a circular cross-section. However, researchers have discovered that changing the geometry of the fiber can radically enhance its physical properties. The new HARFF fiber has an elongated quadrangular, almost ribbon-like cross-section. In experiments, a width-to-thickness ratio of approximately 20:1 was achieved. This shape drastically alters the mechanical response of quartz glass to transverse load. As a result, the experimental pressure sensor created was found to be up to three orders of magnitude (i.e., 1,000 times) more sensitive than similar devices based on traditional round fiber.

### Working Principle: Micro-cavities and "Smart" Alloys

The magic of HARFF lies not only in its shape but also in its internal structure. To give the fiber the ability to determine temperature and pressure, micro-cavities are created within it, and additives in the form of metals and alloys are introduced. For example, to create a highly sensitive thermometer, one of the channels is filled with a tin-based alloy with a melting point of about 220 °C. When heated, the metal expands, creating mechanical stress in the glass that changes the refractive index of light. This change is easily detected by standard telecommunications equipment. For pressure measurement, microstructured fibers with air channels are used, with a resolution reaching units of kilopascals.

### Compatibility with Existing Infrastructure

One of the main advantages of HARFF technology is its compatibility with existing equipment. The flat fiber can be spliced with standard round optical fiber and connected to standard optical equipment. This means that using the new properties does not require purchasing expensive new "hardware" or completely replacing communication networks. The technology is ready for integration into current monitoring systems, which significantly accelerates its commercialization and industrial application.

### Applications: From Aircraft to Batteries

Developers see wide applications for "glass nerves" in various fields. Flat fibers can be embedded directly into composites of aircraft, drones, bridges, and other structures, turning them into self-diagnosing systems. Of particular interest is the possibility of embedding sensors inside batteries to record electrode expansion, gas generation, and dangerous temperature rises, which is critical for preventing fires in electric vehicles and power systems. Additionally, the technology is finding applications in medical monitoring systems where high precision and biocompatibility are required.

## 🔍 Fact-Check Verification

- [Glass taught to feel: new optical fiber is 1,000 times more sensitive than usual](https://3dnews.ru/1146877/steklo-nauchili-chuvstvovat-novoe-optovolokno-okazalos-v-tisyachu-raz-chuvstvitelnee-obichnogo) - Источник подтверждает разработку HARFF исследователями KTH, Саутгемптонского и Бристольского университетов, а также данные о чувствительности и совместимости.

## ❓ FAQ

### Q: What is HARFF?
**A:** HARFF (High Aspect-Ratio Flat Fiber) is a new flat optical fiber with a high width-to-thickness ratio, developed for use as a hypersensitive sensor.

### Q: Is new equipment needed to work with HARFF?
**A:** No, the flat fiber can be spliced with standard optical fiber and connected to existing optical equipment.

### Q: Where can this technology be applied?
**A:** The technology can be used to monitor the condition of aircraft, bridges, batteries, and in medical systems.