ElFys Inc

ElFys Inc is a photodetection technology company based in Espoo, Finland. It designs, develops and manufactures customized photodetectors as well as standard photodiode products, built around its proprietary Black Silicon technology. The company describes its mission as "Capturing Every Ray of Light," and positions its photodiodes on superior photosensitivity, low dark current, fast response times and near-ideal external quantum efficiency across the ultraviolet, visible and near-infrared spectrum. ElFys traces its origins to a research idea that originated at Aalto University in Finland. That research led to the invention of a new type of photodiode, which became the foundation for the company's patented Black Silicon technology. The company has since commercialized this technology into a family of photodetector products and related services for light-detection applications. ElFys organizes its standard offerings into several product lines. The QPD (quadrant photodiode) product line provides accurate positional information on incident light, with exceptional sensitivity of 0.64 A/W at 1064 nm in the near-infrared, and is aimed at YAG laser (1064 nm) systems, laser beam tracking and alignment, atmospheric and space optical communication, and autocollimators. The PD product line offers enhanced photosensitivity across UV, visible and NIR wavelengths with TO-can packaging, targeting high-precision photometry and analytical instruments. The SM product line delivers superior photosensitivity at green, red and NIR wavelengths with low dark current in compact SMD packaging, aimed at health monitoring and wearable electronics. ElFys also offers custom design and processing services. In January 2025 ElFys launched a Black Silicon 4-quadrant detector, which combines high responsivity, low dark current and fast response times with precise positional information. The company highlights applications in YAG laser beam tracking and alignment, defense systems such as laser-guided munitions, free-space optical communication, and autocollimation. ElFys serves more than 100 customers in over 20 countries, with around 90% of its production exported worldwide. Its photodetectors are used in medical devices, analytical instruments and defense technologies. The company is privately held and is headquartered in Espoo, Finland.

ElFys Inc is a photodetection technology company from Espoo, Finland. Its technology originated as a research idea at Aalto University in Finland. According to an Enter Espoo Success Story article highlighted by the company, that research idea led to a "once-in-a-lifetime" moment: the invention of a new type of photodiode that became the foundation for ElFys' patented Black Silicon technology. This origin story places the company within Finland's broader ecosystem of deep-tech spinouts from academic research. Building on that patented technology, ElFys commercialized a family of photodetectors. The company designs, develops and manufactures both customized photodetectors and standard products, following high standards of performance and quality for different industries. Its product portfolio is organized into the QPD (quadrant photodiode) line, the PD (photodiode) line, and the SM (SMD photodiode) line, alongside custom design and processing services. The QPD line provides accurate positional information on incident light, with exceptional sensitivity of 0.64 A/W at 1064 nm in the near-infrared, and is aimed at YAG laser (1064 nm) systems, laser beam tracking and alignment, atmospheric and space optical communication, and autocollimators. The PD line offers enhanced photosensitivity across UV, visible and NIR wavelengths with optimized electrical properties and TO-can packaging, targeting high-precision photometry and analytical instruments. The SM line delivers superior photosensitivity at green, red and NIR wavelengths with low dark current in compact SMD packaging, aimed at health monitoring and wearable electronics. In November 2024 ElFys announced a sneak peek into its upcoming Black Silicon 4-Quadrant Detector, describing it as set to revolutionize near-infrared detection and promising to overcome traditional limitations in NIR detection. The company stated the detector would launch in January 2025. On January 28, 2025, ElFys announced the official launch of the 4-quadrant detector, now available for order. The detector leverages the company's proprietary Black Silicon technology and combines high responsivity, low dark current and fast response times with precise positional information. ElFys highlighted applications including accurately tracking and aligning YAG laser beams (1064 nm), enhancing defense systems particularly for laser-guided munitions, enabling accurate beam pointing and tracking in free-space optical communication systems, and providing precise angular measurements in autocollimation applications. By late 2025, ElFys was featured by Enter Espoo in a Success Story article highlighting its development and unique photodetector technology. At that point the company manufactured ultra-sensitive photodetectors used in medical devices, analytical instruments and defense technologies, and served more than 100 customers in over 20 countries, with around 90% of its production exported worldwide. The company remains headquartered in Espoo, Finland.

• ElFys announces a sneak peek into its upcoming Black Silicon 4-Quadrant Detector, slated for January 2025 launch.

• ElFys officially launches its Black Silicon 4-Quadrant Detector, now available for order.

• ElFys is featured by Enter Espoo in a Success Story article; company serves more than 100 customers in over 20 countries.

Ultra-sensitive, high-performance photodetectors based on proprietary Black Silicon technology, serving medical devices, analytical instruments and defense applications.

• QPD-385-Y (H)

  Quadrant photodiode with 38.5 mm² active area; exceptional sensitivity of 0.64 A/W at 1064 nm in NIR; provides accurate positional information on incident light.

• PD1s / PD4sM / PD5s

  Photodiodes with photosensitive areas of 1 mm², 4 mm² and 5.7 mm²; enhanced photosensitivity across UV, Vis and NIR; TO-can packaging.

• PD25s / PD100s

  Large-area photodiodes with photosensitive areas of 25 mm² and 100 mm².

• SM322 / SM446

  SMD photodiodes with photosensitive areas of 3.22 mm² and 4.66 mm²; superior photosensitivity at green, red and NIR; low dark current; compact SMD packaging.

• Black Silicon 4-Quadrant Detector

  Launched January 2025; leverages proprietary Black Silicon technology; combines high responsivity, low dark current and fast response times with precise positional information.

1. 1ElFys: Photodiodes (official website homepage)elfys.fi
2. 2ElFys Black Silicon 4-Quadrant Detector is Now Availableelfys.fi
3. 3A sneak peek into ElFys Black Silicon 4-Quadrant Detectorelfys.fi
4. 4ElFys featured by Enter Espoo - a success story of innovationelfys.fi
5. 5ElFys Inc - Wikidatawikidata.org