Terahertz Sources and Detectors Patents: Top Filers & Trends 2026
- Concentrated but not locked down. the top 5 assignees hold 30.9% of all 204 records in scope, and the top 10 hold 47.1% — leaving over half the field to a long tail of single- and few-filing entrants.
- Filing has kept climbing, not stalled. from 2021 to 2024 (the last complete filing year), output rose 9 to 10 records, +11% — modest but positive, with 2025-26 figures still filling in due to publication lag.
- Detection and measurement dominate the claim map. G01N (material analysis) and G01J (radiation measurement) together cover more records than the laser and semiconductor-device classes, suggesting sensing applications are outpacing source hardware in claim volume.
Filing growth compares 2021 (9 records) with 2024 (10) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 204 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Terahertz sources and detectors sit at the junction of photonics, semiconductor devices and radio-frequency engineering — spanning photoconductive antennas, quantum cascade lasers and difference-frequency generation schemes, through to the detector-side metamaterial absorbers and focal-plane arrays that read the signal back out. The dataset covers 204 published records filed between 2015 and 2026, searched against title/abstract mentions of terahertz sources or detectors cross-referenced with core technical terms like photoconductive antenna, quantum cascade laser and room temperature operation.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend chart will always look thinner than they eventually turn out to be — the useful comparison is year-over-year change up to the last complete year, not the tail.
Filing trend and technology composition
Two views of the same 204-record dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
Filing rose through 2019, then held a steady mid-teens pace
Filings peaked at 26 in 2019, the high point of the dataset so far. From 2021 (9 records) to 2024 (10 records) — the last year that can be treated as complete — output grew 11%, a modest but real increase rather than a plateau or decline.
Sensing and measurement classes outweigh laser and antenna hardware
G01N (material analysis & testing) appears in 33.3% of the 204 records and G01J (radiation & light measurement) in 21.6%, together outpacing H01S (lasers, 16.7%) and H01L (semiconductor devices, 15.2%). Records can carry multiple IPC codes, so these shares add up to more than 100% — the pattern still points to detection and analytical applications carrying more claim volume than source-generation hardware itself.
Shares are the percentage of the 204 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Terahertz Sources and Detectors with Eureka
This page is one run against one query. Ask Eureka your own question about terahertz sources and detectors and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records anchoring this space
US9711948B2 — Terahertz quantum cascade laser implementing a Čerenkov difference-frequency generation scheme
A terahertz source implementing a Čerenkov difference-frequency generation scheme in a quantum cascade laser, built on an undoped or semi-insulating InP substrate with an exit facet polished at 10°–40°. Waveguide cladding layers sandwich a multiple-quantum-well active layer and a current extraction layer, forming the structure by which terahertz radiation generated in the active region is coupled out at the polished facet.Filed by Board of Regents, The University of Texas System; published 2017-07-18.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7054339B1 | Fiber-laser-based Terahertz sources through difference frequency generation (DFG) by nonlinear optical (NLO) … | 93 |
| 2 | US6144679A | Method and apparatus for providing a coherent terahertz source | 90 |
| 3 | US20080149819A1 | Apparatus and methods for oil-water-gas analysis using terahertz radiation | 74 |
| 4 | US20150276489A1 | Terahertz radiation detector, focal plane array incorporating terahertz detector, multispectral metamaterial … | 71 |
| 5 | CN201662531U | 小型太赫兹时域光谱仪 | 47 |
| 6 | US6605808B2 | Diagnostic apparatus using terahertz radiation | 47 |
| 7 | US8035083B1 | Terahertz tunable sources, spectrometers, and imaging systems | 44 |
| 8 | CN103901404A | 适用于太赫兹雷达和通信系统的MMAOP架构 | 41 |
| 9 | CN102529211A | 一种增强太赫兹辐射吸收率的膜系结构及其制备方法 | 40 |
| 10 | US20060049356A1 | Terahertz spectroscopy | 39 |
Citation counts inside a searched corpus favour older filings — read them as a signal of influence on later filers, not as a measure of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Four figures worth sitting with before deciding where to file or who to watch.
Leadership is real but not a moat
The top 5 assignees combined account for 30.9% of all 204 records in scope, and the top 10 for 47.1%. That leaves more than half the field to assignees outside the ranked leaders — a genuine long tail, not a two-player race.
Growth is steady, not surging
Filing volume moved from 9 records in 2021 to 10 in 2024, a modest 11% rise over that span. Treat 2025-26 figures as incomplete rather than a slowdown; they simply haven't finished publishing.
China and the US lead filing venues closely
China leads with 70 filings and the United States follows closely at 65, with EPO (29), WIPO/PCT (19), Austria (5) and Canada (3) well behind. The near-parity at the top suggests active, parallel prosecution rather than a single dominant jurisdiction.
Co-filing is rare and clustered
Only 5 co-assignee pairs appear in the dataset at all. The strongest, a Chinese security-screening firm paired with a leading university, files together 12 times — far ahead of the next pairs at 4 each, both involving a terahertz-focused research institute.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to terahertz sources and detectors, with the prior art for and against each one.
The assignee landscape
The ranking below covers 100 companies and institutions across the 204 records in scope — the full set the data endpoint returns, not a curated top list.
A single leader, then a fast drop-off
The top-ranked assignee holds 16 records; fifth place holds 10 and tenth place holds 6. The gap from first to fifth is steep, then the ranking flattens into a long tail of single- and few-filing entrants.
Latest-year counts read low across the board
Every tracked leading assignee shows 0 records in the latest year, including one down 100% year over year. This is consistent with publication lag rather than a genuine stop in filing — the true 2025-26 picture will only be visible once those applications publish.
Filing is mostly solo, with a few dense clusters
Co-assignment is uncommon in this dataset — only 5 pairs appear at all, and they cluster around Chinese university-institute-industry relationships, led by a security-screening company filing jointly with a major university 12 times.
| Assignee | Recent year | YoY |
|---|---|---|
| Nuctech Co., Ltd. | 0 | — |
| University of Electronic Science and Technology of China | 0 | -100% |
| Tsinghua University | 0 | — |
| Shenzhen Institute of Terahertz Technology and Innovation | 0 | — |
| Guangdong University of Technology | 0 | — |
| The Regents of the University of California | 0 | — |
| TETECHS | 0 | — |
| Shenzhen Terahertz System Equipment Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to specific questions worth running down before committing a filing or freedom-to-operate budget.
Map the white space claims directly
IPC classes like G02F and H04B carry noticeably fewer records than G01N and G01J — worth a targeted claim-scope search before assuming an approach is clear.
Explore white space in EurekaTrack the leading assignees' next moves
Zero recorded filings in the latest year across tracked leaders is a publication-lag artefact, not a stop signal — worth re-checking in six to twelve months as filings complete publication.
Set up assignee monitoringPressure-test the most-cited prior art
The highest-citation records anchor much of the surrounding claim language; a validity and design-around review of those specific filings is a natural next step.
Review key patents in EurekaCommon questions on terahertz source and detector patents
Across the 204 records in this dataset, filing is led by a single assignee with 16 records, followed by a steep drop to fifth place at 10 and tenth place at 6. The top 5 assignees combined hold 30.9% of all records and the top 10 hold 47.1%, meaning over half the field is spread across a long tail of smaller filers, universities and research institutes. No single company controls the space outright, so freedom-to-operate work still needs to check well beyond the named leaders.
Filing rose from 9 records in 2021 to 10 in 2024, an 11% increase over that span and the last period that can be read as complete. The peak year so far is 2019 at 26 records. Figures for 2025 and 2026 look low, but that reflects the roughly 18-month lag between filing and publication rather than an actual slowdown — those years are still filling in.
US9711948B2 claims a terahertz quantum cascade laser using a Čerenkov difference-frequency generation scheme, built on an undoped or semi-insulating InP substrate with an exit facet polished at an angle of 10° to 40°. The waveguide structure sandwiches a multiple-quantum-well active layer between cladding layers, with a current extraction layer on the substrate, and the polished facet is the specific mechanism by which generated terahertz radiation is coupled out. It was filed by Board of Regents, The University of Texas System and published in 2017, so any design working with Čerenkov-scheme QCL sources on similarly angled facets should review its specific claim language.
Relative to the dominant sensing classes G01N (33.3% of records) and G01J (21.6%), classes covering optical modulation (G02F, 6.9%), antenna integration (H01Q, 8.8%) and terahertz-band transmission systems (H04B, 5.9%) carry noticeably fewer filings. That does not guarantee open claim space, but it does mark areas where a narrower prior-art search is more likely to surface fewer blocking references than in the core detection and laser classes.
China leads with 70 filings in this dataset and the United States follows closely at 65, with the European Patent Office at 29, WIPO/PCT filings at 19, Austria at 5 and Canada at 3. The close China-US totals suggest most serious filers are prosecuting in both jurisdictions rather than favouring one, which is worth factoring into any parallel filing or opposition strategy.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.