Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567609
K. Nawata, Y. Takida, T. Notake, H. Minamide
We studied cascaded backward terahertz-wave parametric oscillation (BW-TPO) to enhance the output THz-wave power. The pump beam converted to the photon pair of counter-propagating THz-wave and co-propagating idler beam. The idler beams also acted as a pump beam for the cascaded THz-wave generation. The oscillation threshold of cascaded process was reduced 77% compared with the primary one thanks to the spectrum overlaps of counter-propagating THz waves. Furthermore, optical injection seeding to the first idler beam provided threshold reduction of the primary one. Output peak power of THz-wave reached 205 W with the pulse width of 0.78 ns at the frequency of 0.3 THz.
{"title":"Over 200 W Peak-Power Cascaded Backward Terahertz-Wave Parametric Oscillator at 0.3 THz","authors":"K. Nawata, Y. Takida, T. Notake, H. Minamide","doi":"10.1109/IRMMW-THz50926.2021.9567609","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567609","url":null,"abstract":"We studied cascaded backward terahertz-wave parametric oscillation (BW-TPO) to enhance the output THz-wave power. The pump beam converted to the photon pair of counter-propagating THz-wave and co-propagating idler beam. The idler beams also acted as a pump beam for the cascaded THz-wave generation. The oscillation threshold of cascaded process was reduced 77% compared with the primary one thanks to the spectrum overlaps of counter-propagating THz waves. Furthermore, optical injection seeding to the first idler beam provided threshold reduction of the primary one. Output peak power of THz-wave reached 205 W with the pulse width of 0.78 ns at the frequency of 0.3 THz.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"34 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73665812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567226
M. Forghani, A. Babakhani
This article presents a fully integrated terahertz (THz) pulse radiator that is based on the sharpening effect of nonlinear transmission lines (NLTL). As the sinusoidal input travels along the line, its width shrinks, and high frequency harmonics are generated. Implemented in 65-nm CMOS technology and consuming no DC power, this chip generates and radiates a broadband frequency comb through its on-chip antenna that covers 20-700 GHz band with adjustable frequency space between the tones. The EIRP at 400 GHz, 550 GHz, and 700 GHz are -48, -63, and -70 dB, respectively.
{"title":"A CMOS Terahertz Pulse Radiator with Zero DC Power Consumption Based on Nonlinear Transmission Line Sharpening Effect","authors":"M. Forghani, A. Babakhani","doi":"10.1109/IRMMW-THz50926.2021.9567226","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567226","url":null,"abstract":"This article presents a fully integrated terahertz (THz) pulse radiator that is based on the sharpening effect of nonlinear transmission lines (NLTL). As the sinusoidal input travels along the line, its width shrinks, and high frequency harmonics are generated. Implemented in 65-nm CMOS technology and consuming no DC power, this chip generates and radiates a broadband frequency comb through its on-chip antenna that covers 20-700 GHz band with adjustable frequency space between the tones. The EIRP at 400 GHz, 550 GHz, and 700 GHz are -48, -63, and -70 dB, respectively.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"76 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73909805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567253
M. Konnikova, T. Heinz, A. Mankova, O. Cherkasova, A. Butylin, Y. Peng, A. Shkurinov
Spectral properties of S and S1 spike proteins were studied using vibration spectroscopy methods. Also, vibration signatures of amino acids that make up the RGD, the part of S1 protein responsible for adhesion, were studied by Terahertz (THz) time-domain, Infrared (IR) and Raman spectroscopies in the low-frequency and in the fingerprint. THz metamaterials have been developed that increase the sensitivity of THz spectroscopy to the presence of both proteins. We have studied the spectra of amino acids, which play a role in the adhesion of proteins, on the metal surfaces of metamaterials, aluminum, and gold. Spectral differences were found between S and S1 proteins of SARS-CoV-2. The spectral differences between amino acids prepared in the form of thin films and in the form of bulk sample are discussed.
{"title":"Terahertz and Infrared Spectroscopy of SARS-CoV-2 Spike Protein","authors":"M. Konnikova, T. Heinz, A. Mankova, O. Cherkasova, A. Butylin, Y. Peng, A. Shkurinov","doi":"10.1109/IRMMW-THz50926.2021.9567253","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567253","url":null,"abstract":"Spectral properties of S and S1 spike proteins were studied using vibration spectroscopy methods. Also, vibration signatures of amino acids that make up the RGD, the part of S1 protein responsible for adhesion, were studied by Terahertz (THz) time-domain, Infrared (IR) and Raman spectroscopies in the low-frequency and in the fingerprint. THz metamaterials have been developed that increase the sensitivity of THz spectroscopy to the presence of both proteins. We have studied the spectra of amino acids, which play a role in the adhesion of proteins, on the metal surfaces of metamaterials, aluminum, and gold. Spectral differences were found between S and S1 proteins of SARS-CoV-2. The spectral differences between amino acids prepared in the form of thin films and in the form of bulk sample are discussed.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"93 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73929855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567497
Robin Zatta, U. Pfeiffer
Silicon lenses are widely employed to turn a terahertz (THz) focal-plane array into a THz camera. For the first time, we have identified the type of radial distortion caused by such lenses. To this end, we measured all single-pixel far-field radiation patterns of a 15-mm diameter 2.75-mm extended hemispherical silicon lens-integrated 32×32-pixel CMOS camera at 0.652 THz. From this, a beam incidence angle grid has been generated, indicating barrel distortion. The measured beam incidence angle is compared to a previously published closed-form relation between scan angle and feed position for extended hemispherical lenses. The presented results are essential for all beam switching applications based on dielectric extended hemispherical lenses with an elliptical extension realized in the lens center.
{"title":"Radial Distortion in Silicon Lens-Integrated THz Cameras","authors":"Robin Zatta, U. Pfeiffer","doi":"10.1109/IRMMW-THz50926.2021.9567497","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567497","url":null,"abstract":"Silicon lenses are widely employed to turn a terahertz (THz) focal-plane array into a THz camera. For the first time, we have identified the type of radial distortion caused by such lenses. To this end, we measured all single-pixel far-field radiation patterns of a 15-mm diameter 2.75-mm extended hemispherical silicon lens-integrated 32×32-pixel CMOS camera at 0.652 THz. From this, a beam incidence angle grid has been generated, indicating barrel distortion. The measured beam incidence angle is compared to a previously published closed-form relation between scan angle and feed position for extended hemispherical lenses. The presented results are essential for all beam switching applications based on dielectric extended hemispherical lenses with an elliptical extension realized in the lens center.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"34 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84300068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566951
A. Gupta, V. Gupta, A. Sharma, G. Polónyi, J. Fülöp
Ultrafast carrier dynamics in n-doped Ge is investigated by THz pump—THz probe spectroscopy with pump THz field strengths up to <0.45 MV/cm provided by a user-accessible compact nonlinear THz spectroscopy facility at ELI-ALPS. The saturation and recovery of the free-carrier absorption is observed on picosecond time scale at 300 K and 95 K temperatures. Furthermore, the intensity-dependent modulation of the refractive index is also observed.
{"title":"Ultrafast Nonlinear Carrier Dynamics in n-Doped Ge at High Field Strengths","authors":"A. Gupta, V. Gupta, A. Sharma, G. Polónyi, J. Fülöp","doi":"10.1109/IRMMW-THz50926.2021.9566951","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566951","url":null,"abstract":"Ultrafast carrier dynamics in n-doped Ge is investigated by THz pump—THz probe spectroscopy with pump THz field strengths up to <0.45 MV/cm provided by a user-accessible compact nonlinear THz spectroscopy facility at ELI-ALPS. The saturation and recovery of the free-carrier absorption is observed on picosecond time scale at 300 K and 95 K temperatures. Furthermore, the intensity-dependent modulation of the refractive index is also observed.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"4 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85198393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566974
A. Balakin, V. Gildenburg, N. Kuzechkin, P. Solyankin, I. Pavlichenko, Yiming Zhu, A. Shkurinov
A supersonic jet consisting of noble gas clusters is considered as a source of terahertz (THz) radiation pumped by high-power femtosecond laser system. We present the results of experimental studies on optimizing the intensity and diagram pattern of the THz radiation generated in cluster jet and demonstrate that under certain conditions of the jet excitation, it is possible to form a cluster filament that radiates THz waves with a maximum intensity along the direction of the laser beam propagation. Provided phenomenological model is in a good agreement with experimental results and well explains observed phenomenon.
{"title":"Controlling directivity pattern and intensity of THz radiation during its generation in a gas-clatter jet","authors":"A. Balakin, V. Gildenburg, N. Kuzechkin, P. Solyankin, I. Pavlichenko, Yiming Zhu, A. Shkurinov","doi":"10.1109/IRMMW-THz50926.2021.9566974","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566974","url":null,"abstract":"A supersonic jet consisting of noble gas clusters is considered as a source of terahertz (THz) radiation pumped by high-power femtosecond laser system. We present the results of experimental studies on optimizing the intensity and diagram pattern of the THz radiation generated in cluster jet and demonstrate that under certain conditions of the jet excitation, it is possible to form a cluster filament that radiates THz waves with a maximum intensity along the direction of the laser beam propagation. Provided phenomenological model is in a good agreement with experimental results and well explains observed phenomenon.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"117 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85502503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567539
Jin Zhao, L. Yin, Feng‐Yuan Han, Yi-Dong Wang, Tie-jun Huang, Pu‐Kun Liu
Spoof surface plasmons (SSPs) can manipulate electromagnetic waves with subwavelength prints, which offers possibilities for many applications. To generate the SSPs propagating on a two-dimensional (2D) scale, the all-dielectric or dielectric-metal metasurfaces are generally exploited. However, the power capacity of the all-dielectric or dielectric-metal metasurfaces is relatively low. In this work, a 2D groove metal array is utilized to generate the SSPs. The dimension of the grooves is changed to possess the SSPs propagating on it. Based on this principle, a 2D half-Maxwell-fisheye lens is proposed utilizing the groove metal array, on which a spot on one side of the lens can diverge to a plane wave on the exit facet in the simulation. The all-metal half-Maxwell-fisheye lens is capable to be employed for high-power application scenarios.
{"title":"Design of a Half-Maxwell-Fisheye Lens Based on the Surface Plasmon Polarizations","authors":"Jin Zhao, L. Yin, Feng‐Yuan Han, Yi-Dong Wang, Tie-jun Huang, Pu‐Kun Liu","doi":"10.1109/IRMMW-THz50926.2021.9567539","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567539","url":null,"abstract":"Spoof surface plasmons (SSPs) can manipulate electromagnetic waves with subwavelength prints, which offers possibilities for many applications. To generate the SSPs propagating on a two-dimensional (2D) scale, the all-dielectric or dielectric-metal metasurfaces are generally exploited. However, the power capacity of the all-dielectric or dielectric-metal metasurfaces is relatively low. In this work, a 2D groove metal array is utilized to generate the SSPs. The dimension of the grooves is changed to possess the SSPs propagating on it. Based on this principle, a 2D half-Maxwell-fisheye lens is proposed utilizing the groove metal array, on which a spot on one side of the lens can diverge to a plane wave on the exit facet in the simulation. The all-metal half-Maxwell-fisheye lens is capable to be employed for high-power application scenarios.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"218 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79740380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567237
Yuma Sasaki, T. Otsuji, A. Satou
Plasmon-polariton modes in an InGaAs-HEMT-based plasmonic THz detector integrated with 2D nano-antennas are theoretically investigated. We show that the incident THz wave polarized in the channel width direction can be converted into a cross-polarized plasmon mode in the channel length direction via the 2D nano-antennas, indicating a possibility of realizing polarization-insensitive THz detection by the plasmonic detector.
{"title":"Modal Analysis of Plasmon-Polaritons in Plasmonic THz Detector Integrated with Two-Dimensional Nano-Antennas","authors":"Yuma Sasaki, T. Otsuji, A. Satou","doi":"10.1109/IRMMW-THz50926.2021.9567237","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567237","url":null,"abstract":"Plasmon-polariton modes in an InGaAs-HEMT-based plasmonic THz detector integrated with 2D nano-antennas are theoretically investigated. We show that the incident THz wave polarized in the channel width direction can be converted into a cross-polarized plasmon mode in the channel length direction via the 2D nano-antennas, indicating a possibility of realizing polarization-insensitive THz detection by the plasmonic detector.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"86 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84170328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567647
Shuting Wu, Jun Zhou, Jiajia Qian, Zheng Zhu, Shuai Liu, Lichuan Jin
Currently spintronic THz sources have the advantages of low cost, high efficiency, and easy integration, so it can be used to integrate feature-rich devices. In this paper, we demonstrate the function of THz sensing by metasurface integrated with spintronic THz emitter. Through electromagnetic simulation, the resonant frequency point of metasurface was designed to be around 0.8 THz. Then the metasurface was fabricated on a quartz substrate and shared the substrate with a spintronic emitter. This integrated THz biosensor was used to measure the transmittance spectra of water, alcohol and olive oil. The experimental results show that it is sensitive for identifying different liquids according to the frequency shift.
{"title":"THz Biosensor Based on Metasurface Integrated with Spintronic Emitter","authors":"Shuting Wu, Jun Zhou, Jiajia Qian, Zheng Zhu, Shuai Liu, Lichuan Jin","doi":"10.1109/IRMMW-THz50926.2021.9567647","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567647","url":null,"abstract":"Currently spintronic THz sources have the advantages of low cost, high efficiency, and easy integration, so it can be used to integrate feature-rich devices. In this paper, we demonstrate the function of THz sensing by metasurface integrated with spintronic THz emitter. Through electromagnetic simulation, the resonant frequency point of metasurface was designed to be around 0.8 THz. Then the metasurface was fabricated on a quartz substrate and shared the substrate with a spintronic emitter. This integrated THz biosensor was used to measure the transmittance spectra of water, alcohol and olive oil. The experimental results show that it is sensitive for identifying different liquids according to the frequency shift.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"71 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81853445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567047
V. Kostin, I. Laryushin, N. Vvedenskii
The optimal waveform of an ionizing pulse and the corresponding maximum values of the density of residual terahertz currents are found analytically. The solutions obtained can be realized using multicolor femtosecond pulses containing a field at the fundamental frequency and several of its initial harmonics. The amplitudes of odd harmonics in the optimal field are larger than those of neighboring even harmonics. The maximum residual current density increases with the number of harmonics, the fundamental wavelength, and the ionization potential of gas particles and decreases with the duration of the ionizing pulse, approaching the ceiling values when few-cycle pulses are used.
{"title":"Saturation of Terahertz Generation by Multicolor Ionizing Pulses","authors":"V. Kostin, I. Laryushin, N. Vvedenskii","doi":"10.1109/IRMMW-THz50926.2021.9567047","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567047","url":null,"abstract":"The optimal waveform of an ionizing pulse and the corresponding maximum values of the density of residual terahertz currents are found analytically. The solutions obtained can be realized using multicolor femtosecond pulses containing a field at the fundamental frequency and several of its initial harmonics. The amplitudes of odd harmonics in the optimal field are larger than those of neighboring even harmonics. The maximum residual current density increases with the number of harmonics, the fundamental wavelength, and the ionization potential of gas particles and decreases with the duration of the ionizing pulse, approaching the ceiling values when few-cycle pulses are used.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"59 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84089882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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