Terahertz Source Patents: Leaders, Trends & White Space 2026
- Filing has flattened, not grown. activity peaked at 6 families in 2020 and sits at 4 by the 2022 midpoint, with no assignee showing momentum in the latest tracked year.
- Claims cluster in lasers, not devices. H01S covers 25 of the underlying records versus 9 in G02F, meaning source-generation and emission mechanisms are far more contested than modulation and control.
- China is the dominant receiving office. 22 of the tracked filings entered via China against 7 in the United States, a gap worth checking before assuming US-centric prior art is exhaustive.
What terahertz source patents actually cover
Terahertz source technology spans the generation mechanisms used to produce radiation in the roughly 0.1–10 THz band: photoconductive antennas, difference-frequency generation, quantum cascade lasers adapted for THz output, and more recently spintronic and orientation-patterned semiconductor emitters. The dataset behind this page pulls 38 patent families published between 2015 and mid-2026 that combine THz-source search terms with IPC classes covering lasers, semiconductor devices and optical modulation. Family counts, not raw document counts, are used throughout so that multi-jurisdiction filing strategies do not distort the picture.
Because publication typically lags filing by around 18 months, the most recent filing years in any trend chart will understate true activity — treat the last one to two years as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 38 families: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A flat-to-declining filing curve
Filings ran from 3 in 2017 to a peak of 6 in 2020, back to 4 at the 2022 midpoint, and down toward 0 by the most recent (partial) year. This is a small, mature-shaped corpus rather than a fast-growing one — read the tail year as incomplete rather than as a genuine drop-off.
Lasers dominate the classification spread
H01S (lasers and stimulated emission) appears in 25 of the 38 records, more than double the next subclass, H01L (semiconductor devices) at 11. G02F (optical control and modulation), G01J (radiation measurement), G01N, G02B, H01Q and H10N each appear in single digits, marking them as adjacent rather than core to where applicants are actually claiming.
Shares are the percentage of the 38 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Terahertz Source Technology Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about terahertz source technology landscape and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
EP4080178B1 — Spintronic Terahertz Emitter (Freie Universität Berlin)
Granted 2025-07-23 to Freie Universität Berlin, this patent sits in the spintronic emitter branch of the field — the same branch that produced the highly-cited US11199447B1 on narrowband spintronic THz emission, and reflects a co-filing relationship with Johannes Gutenberg University Mainz that is the strongest assignee pairing in this dataset.Number, assignee and date are drawn directly from the record; no claim scope beyond the title is asserted here.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7339718B1 | Generation of terahertz radiation in orientation-patterned semiconductors | 59 |
| 2 | US20190227404A1 | Terahertz Radiation Emitters | 29 |
| 3 | CN109478577A | 太赫兹辐射发射器 | 23 |
| 4 | US20190150719A1 | Terahertz Endoscopy through Laser-Driven Terahertz Sources and Detectors | 20 |
| 5 | US11199447B1 | Single-mode, high-frequency, high-power narrowband spintronic terahertz emitter | 12 |
| 6 | WO2018017018A1 | Terahertz radiation emitters | 11 |
| 7 | CN115441297A | 增强非线性薄膜宽带的太赫兹源装置、其制备及增强方法 | 10 |
| 8 | CN105449494A | 基于波导结构的内调制太赫兹源及其内调制方法 | 8 |
| 9 | WO2022223527A1 | Spintronic terahertz emitter | 6 |
| 10 | CN112563864A | 一种基于自旋滤波的太赫兹发射器及其制备方法 | 6 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a proxy for 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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Three read-outs from the dataset that matter more than the headline family count.
Growth has stalled, not accelerated
A peak in 2020 followed by a flat-to-declining midpoint suggests the core generation mechanisms — photoconductive antennas, DFG, QCL-based sources — are reaching claim saturation rather than seeing a new filing wave. New entrants should expect denser prior art in the established mechanisms and more room in adjacent detection or integration claims.
China is the primary filing venue
Nearly three-fifths of tracked filings entered via the China receiving office, well ahead of the United States, WIPO/PCT and European routes combined. Freedom-to-operate work that only screens US and EPO records risks missing the bulk of active claim activity in this field.
Lasers carry the claim density
H01S appears in two-thirds of records, more than double H01L and nearly triple G02F. Antenna-class filings (H01Q) and solid-state device filings (H10N) each sit at single-digit counts, marking the antenna and spintronic-device angles as comparatively open relative to laser-based generation.
Co-filing is rare and academic
Only three co-assignee pairings appear across the corpus, the strongest being a German university pairing filing together four times. This is a field of largely independent filers rather than joint-venture or supply-chain co-filing, which changes how licensing conversations should be approached.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to terahertz source technology landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Johannes Gutenberg University Mainz | Freie Universität Berlin | 4 |
| Tianjin University | Beijing Institute of Remote Sensing Equipment | 2 |
| University of Shanghai for Science and Technology | Shanghai Institute of Radio Equipment | 1 |
The Mainz–Berlin university pairing accounts for the majority of observed co-assignee activity; the remaining pairs (Tianjin University with a Beijing remote-sensing institute, and a Shanghai university with a Shanghai radio-equipment institute) each appear once or twice, pointing to isolated domestic research collaborations rather than a broader industry pattern.
Who is filing, and where the gaps sit
The assignee list is a long tail: no single filer shows momentum in the most recent tracked year, and academic institutions outnumber corporate filers among the most active names.
No current leader is actively accelerating
Every one of the most-active assignees in this dataset — spanning Chinese, German, Singaporean and US institutions — shows zero filings in the latest tracked year. That is consistent with a field where publication lag masks recent activity, but it also means no single lab or company can currently be called the clear technology leader on filing pace alone.
Academic and government labs dominate the ranking
Named assignees include multiple universities, a national research foundation and a government health-services filer, alongside Chinese university and institute pairings. This is a research-stage field: commercial assignees are present but do not dominate the top of the ranking the way they would in a mature consumer-electronics landscape.
Influence sits with older orientation-patterned and antenna work
The highest-cited record in the corpus dates from the orientation-patterned semiconductor generation approach, well ahead of more recent spintronic emitter filings on citation count. That gap reflects age within the corpus more than present-day relevance — newer spintronic and endoscopy-oriented filings are still accumulating citations.
| Assignee | Recent year | YoY |
|---|---|---|
| Tianjin University | 0 | — |
| Johannes Gutenberg University Mainz | 0 | — |
| Freie Universität Berlin | 0 | — |
| National University of Singapore | 0 | — |
| United States Government, as represented by the Secretary of Health and Human Services | 0 | — |
| Wisconsin Alumni Research Foundation | 0 | — |
| Beijing Institute of Remote Sensing Equipment | 0 | — |
| The Regents of the University of California | 0 | — |
Where to take this
The dataset points to specific next steps depending on whether you are scoping freedom-to-operate, choosing a filing venue, or looking for open claim territory.
Check China filings before finalising FTO scope
With 22 of 38 tracked filings entering through the China receiving office against 7 in the US, any freedom-to-operate review anchored on US and EPO records alone is working from a partial picture of this field.
Explore the full assignee ranking in EurekaTreat spintronic and antenna-integrated routes as less crowded
H01Q and H10N classifications each appear in only a handful of the 38 records, well below the H01S laser cluster, suggesting these branches carry more room for a differentiated first claim.
Run a white-space search in EurekaWatch for the publication-lag undercount in 2024-2026 data
The apparent decline toward the most recent year is partly a reporting artefact — filings from the last 18 months are still working through publication, so a fresh pull closer to a filing decision is worth running.
Set up a monitoring alert in EurekaCommon questions on terahertz source patents
This dataset of 38 patent families shows a long tail rather than a single dominant holder: the most-active assignees include several universities (in China, Germany and Singapore), a national research foundation, and a US government health-services filer, with none showing more than a handful of families each. No assignee in the top ranking recorded any filings in the latest tracked year, which is consistent with a research-stage field where activity is spread across many small filers rather than concentrated at one lab or company. Anyone doing competitive tracking should watch the group of top assignees collectively rather than a single named leader.
Photoconductive antenna approaches, which classify heavily under H01S and H01Q in this dataset, generate THz radiation by exciting a biased semiconductor gap with an ultrafast laser pulse, and represent some of the oldest and most-cited filings in the corpus. Spintronic emitters, exemplified by the representative EP4080178B1 filing and the highly-cited US11199447B1, generate THz output through spin-to-charge conversion in magnetic heterostructures and are a comparatively newer, less densely claimed branch. The patent evidence suggests photoconductive antenna claim space is more occupied, while spintronic emitter claims are still being actively defined.
Based on the tracked filing trend, activity peaked at 6 families in 2020, sat at 4 by the 2022 midpoint, and trails toward 0 in the most recent partial year — a flat-to-declining pattern rather than sustained growth. Because publication typically lags filing by around 18 months, the last one to two years understate true filing activity and should not be read as a real collapse. The honest read is that this is a mature, small-corpus field with periodic activity rather than one in a current growth phase.
H01S, the classification for lasers and stimulated emission devices, appears in 25 of the 38 tracked records, making it the dominant subclass by a wide margin. H01L (semiconductor devices) follows at 11 records and G02F (optical control and modulation) at 9. Subclasses such as H01Q (antennas) and H10N (other solid-state devices) appear only a handful of times each, marking them as comparatively under-claimed relative to the laser-centric core of the field.
The classification spread points toward antenna-integrated THz sources and spintronic emitter architectures as less densely claimed than laser-based generation mechanisms, since H01Q and H10N each cover only a few of the 38 tracked records versus 25 for H01S. THz endoscopy and medical-source integration, referenced in one of the more highly-cited recent filings, is another area with limited direct competition in this corpus. Any first claim in these areas should be checked against the specific most-cited records in the same branch, since citation-heavy older patents can still constrain a compact-device or integration claim even in an otherwise open subclass.
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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.