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Patent US3899428A successfully refreshed from Google Patents.
US3899428A
Expired / Lapsed
US
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Millimeter wave devices utilizing electrically polarized media
Assignee: AT&T Inc
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Filing: 1972-03-07
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Granted: 1975-08-12
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Expires: 1992-03-07
Abstract
Abstract Electrical impulses within the frequency range of from one to 10,000 gigahertz are generated by the change in dipole moment resulting from the excitation of an atomic or molecular species from an electronic ground state to an excited state. Such excitation results from the direct absorption of irradiating wave energy by such species within an electrically polarized-usually pyroelectric-medium. Devices based on this mechanism may be designed to modulate or demodulate carriers in the infrared and visible spectra or may serve as primary oscillators generating carriers within the described frequency range.
Inventors
- 👤 David Henry Auston
- 👤 Alastair Malcolm Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/353; G02F1/3534; G02F2203/00; G02F2203/13
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
225 words
APPARATUS COMPRISING A TRANSDUCER FOR ALTERING INCOMING ELECTROMAGNETIC RADIATION PROVIDED WITH FIRST MEANS FOR RECEIVING RADIATION AND SECOND MEANS FOR EMITTING THE ALTERED ENERGY, SAID RADIATION BEING WITHIN A RANGE HAVING A MAXIMUM WAVELENGTH OF 10 MICROMETERS AND MANIFESTING A VARIATION IN INPUT RADIATION INTENSITY ON A TIME SCALE CORRESPONDING WITH A CYCLE TIME OF UP TO ABOUT 10 TERAHERTZ, SAID TRANSDUCER BEING SO ADAPTED AS TO EMIT AN ELECTRICAL SIGNAL HAVING AN ELECTRIC FIELD VARIATION CORRESPONDING TO THE SAID VARIATION, CHARACTERIZED IN THAT SAID TRANSDUCER CONSISTS ESSENTIALLY OF A BODY WHICH IS CAPABLE OF MANIFESTING ELECTRICAL POLARIZATION ON A MACROSCALE AND CONTAINING AN ABSORBING SPECIES HAVING A MAXIMUM ABSORBATION LENGTH FOR THE SAID RADIATION OF ABOUT 0.2CM, SUBSTANTIALLY THE ENTIRETY OF THE ABSORPTION RESPONSIBLE FOR THE SAID ABSORPTION LENGTH BEING DUE TO A CHARGE IN ELECTRONIC CONFIGURATION FROM A GROUND STATE TO AN EXCITED STATE WITHIN THE SAID ABSORBING SPIECES, THE SAID ABSORBING SPIECES HAVING A DIPOLE MOMENT IN THE GROUND STATE OF AT LEAST 0.01 DEBYE WHEN THE ENVIORMENT OF THE ABSORBING SPIECES WITHIN THE SAID BODY IS POLAR, WHEREBY ELECTRONI EXCITATION RESULTS IN AN ELECTRICAL IMPULSE WITH THE NET ELECTRICAL SIGNAL REPRESENTING NET EFFECT OF THE TOTALITY OF SUCH IMPULES RESPONSIVE TO THE SAID VARIATION OF INCOMING ELECTROMAGNETIC RADIATION SAID SECOND MEANS INCLUDING MEANS FOR COUPLING SAID ELECTRICAL SIGNAL TO UTILIZATION MEANS.
Claim 2
Dependent Claim
225 words
APPARATUS COMPRISING A TRANSDUCER FOR ALTERING INCOMING ELECTROMAGNETIC RADIATION PROVIDED WITH FIRST MEANS FOR RECEIVING RADIATION AND SECOND MEANS FOR EMITTING THE ALTERED ENERGY, SAID RADIATION BEING WITHIN A RANGE HAVING A MAXIMUM WAVELENGTH OF 10 MICROMETERS AND MANIFESTING A VARIATION IN INPUT RADIATION INTENSITY ON A TIME SCALE CORRESPONDING WITH A CYCLE TIME OF UP TO ABOUT 10 TERAHERTZ, SAID TRANSDUCER BEING SO ADAPTED AS TO EMIT AN ELECTRICAL SIGNAL HAVING AN ELECTRIC FIELD VARIATION CORRESPONDING TO THE SAID VARIATION, CHARACTERIZED IN THAT SAID TRANSDUCER CONSISTS ESSENTIALLY OF A BODY WHICH IS CAPABLE OF MANIFESTING ELECTRICAL POLARIZATION ON A MACROSCALE AND CONTAINING AN ABSORBING SPECIES HAVING A MAXIMUM ABSORBATION LENGTH FOR THE SAID RADIATION OF ABOUT 0.2CM, SUBSTANTIALLY THE ENTIRETY OF THE ABSORPTION RESPONSIBLE FOR THE SAID ABSORPTION LENGTH BEING DUE TO A CHARGE IN ELECTRONIC CONFIGURATION FROM A GROUND STATE TO AN EXCITED STATE WITHIN THE SAID ABSORBING SPIECES, THE SAID ABSORBING SPIECES HAVING A DIPOLE MOMENT IN THE GROUND STATE OF AT LEAST 0.01 DEBYE WHEN THE ENVIORMENT OF THE ABSORBING SPIECES WITHIN THE SAID BODY IS POLAR, WHEREBY ELECTRONI EXCITATION RESULTS IN AN ELECTRICAL IMPULSE WITH THE NET ELECTRICAL SIGNAL REPRESENTING NET EFFECT OF THE TOTALITY OF SUCH IMPULES RESPONSIVE TO THE SAID VARIATION OF INCOMING ELECTROMAGNETIC RADIATION SAID SECOND MEANS INCLUDING MEANS FOR COUPLING SAID ELECTRICAL SIGNAL TO UTILIZATION MEANS.
Claim 3
Dependent Claim
14 words
Apparatus of claim 1 in which the said incoming radiation includes a pulsed component.
Claim 4
Dependent Claim
16 words
Apparatus of claim 2 in which the incoming radiation consists essentially of the said pulsed component.
Claim 5
Dependent Claim
32 words
Apparatus of claim 3 in which a pulse is of duration of a maximum of about 1000 picoseconds (such pulses containing spectral components of a frequency of up to about 1 GHz).
Claim 6
Dependent Claim
30 words
Apparatus of claim 1 in which at least a component of the said incoming radiation is at least quasi continuous, i.e., is CW for a period corresponding with many cycles.
Claim 7
Dependent Claim
12 words
Apparatus of claim 5 in which the said radiation includes two frequencies.
Claim 8
Dependent Claim
32 words
Apparatus of claim 6 in which at least a part of the said variation in radiation intensity is the result of the difference signal developed from beating of the two said frequencies.
Claim 9
Dependent Claim
22 words
Apparatus of claim 7 in which the two said frequencies are separated by a frequency difference of a minimum of 1 MHz.
Claim 10
Dependent Claim
20 words
Apparatus of claim 1 in which the said electrical polarization is induced by a field external to the said body.
Claim 11
Dependent Claim
15 words
Apparatus of claim 1 in which the said polar environment is due to spontaneous polarization.
Claim 12
Dependent Claim
18 words
Apparatus of claim 10 in which the said absorbing species is a dopant contained within the said body.
Claim 13
Dependent Claim
36 words
Apparatus of claim 11 in which the absorption length is a maximum of 0.1 cm and in which the absorbing species has a ground state dipole moment within the said body of at least 0.1 Debye.
Claim 14
Dependent Claim
19 words
Apparatus of claim 1 in which said body is a radiator so that the said altered energy is radiated.
Claim 15
Dependent Claim
14 words
Apparatus of claim 13 in which the said second means includes a transmission line.
Claim 16
Dependent Claim
13 words
Apparatus of claim 14 in which the said transmission line is essentially nondispersive.
Claim 17
Dependent Claim
25 words
Apparatus of claim 15 in which the said transmission line is provided with separated conductive elements so as to cause propagation of a TEM mode.
Claim 18
Dependent Claim
12 words
Apparatus of claim 15 in which the said transmission line is electro-optic.
Claim 19
Dependent Claim
94 words
Apparatus of claim 17 in which the said second means includes means for irradiating the said transmission line with radiation within the transparency bandwidth of the said transmission line in a direction orthogonal to the said electrical impulse for at least a portion of the period of traversal of the altered energy within the said line so that the transmission properties of the said transmission line for the irradiating radiation are altered during the period of coincidence between the said altered energy and radiation incident on the transmission line due to the said irradiation.
Claim 20
Dependent Claim
22 words
Apparatus of claim 18 in which the said altered energy is detected as a response to the said change in transmission properties.
Claim 21
Dependent Claim
30 words
Apparatus of claim 1 in which the electrical impulse includes a carrier with an imposed modulation signal corresponding with at least a component of the said variation in radiation intensity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |