Satyr Research Articles

Dynamic range limitations of non-coherent continous-wave THz photomixing systems with broadband detectors

The dynamic range of non-coherent continuous-wave (CW) THz photomixing (PM) systems with broadband detectors can be significantly limited by various parasitic effects. Specifically, we examine the generation of parasitic (i) THz and (ii) IR radiation, and (iii) higher harmonics in CW THz PM emitters. (i) The parasitic broadband THz radiation, spanning from 100 to 250 GHz with a total output power of 20 nW, results from not perfectly clean laser spectra. As a result, for a frequency-flat Golay cell detector, the PM-system dynamic range is limited to 32.8 dB at 500 GHz, 26.7 dB at 1 THz, and 8.5 dB at 2.3 THz. In the case of detectors with a frequency-declining responsivity, the dynamic range can drop by ∼10 dB more. (ii) The IR radiation leaking from a PM emitter (≈20 μW) is sensitive to the PM emitter bias, which results in its modulation with an amplitude of about 1.3 μW, when a standard PM-emitter bias modulation is applied. The detected IR radiation could be confused for the THz signal. (iii) Parasitic generation of higher harmonics in PM systems can also limit the system’s dynamic range or create spectral artifacts. However, we show that the harmonics are low at least at ∼1 THz and above. Specifically, they are less than 400 pW for fundamental frequencies above 750 GHz, which is more than 43 dB below the power of the fundamental harmonic. The above-stated values were obtained for a commonly-used PIN-diode photomixer mounted on a Si lens and 1.5 μm distributed-feedback lasers. In general, suppression of these parasitic signals is crucial for non-coherent CW THz PM systems.

Over-the-Air Characterization of a Steerable Sub-THz Si Lens and On-Chip Antenna System

Over-the-Air Characterization of a Steerable Sub-THz Si Lens and On-Chip Antenna System

Everything to Do with Dionysus: Reading The Birth of Tragedy through the Lens of Satyr Play

Everything to Do with Dionysus: Reading The Birth of Tragedy through the Lens of Satyr Play

Effects of Gamma-ray and neutron irradiation on infrared optical properties of ZnSe and ZnS for ITER divertor thermography

Gamma-ray and neutron irradiation tests were performed by using antireflective-coated and non-antireflective-coated samples of ZnSe and ZnS to examine the impact on their infrared optical properties. In neutron irradiation tests, ZnSe and ZnS samples showed minimal transmittance reduction even up to 1.44 × 1016 n/cm2 (evaluated by dpa value, the values are 5.77 × 10−6, 2.07 × 10−5 for ZnSe and ZnS, respectively), about 5.8 times higher than the expected neutron fluence in ITER. Gamma irradiation at 100 kGy did not affect any of the samples, however, at 5.6 MGy (2.6x the expected dose of ITER), non-antireflective-coated ZnSe and ZnS exhibited induced absorption bands. Antireflective coating did partially mitigate this effect, but ZnS, even with antireflective coating, showed up to 2.5 % degradation over the wide wavelength range of 1.5–4.5 µm, whereas ZnSe was less affected. Both ZnSe and ZnS exhibited a modest 2 % absorption around 3 µm. Surface analysis by SEM, laser microscope, and XPS linked the 3-µm degradation to gamma-irradiation-induced Zn(OH)2 formation that was confined to the surface. Thus, transmittance degradation of ZnSe over the lifespan of ITER was estimated to be a maximum of approximately 7.8 %. The practical use of ZnSe in the IRTh system requires further evaluation with Si and CaF2 lenses and for the optical design to be finalized. Nevertheless, these findings suggest that ZnSe is a promising candidate for the IRTh system's lenses.

Onphale, a satyr play by Ion of Chios

O drama satírico Ônfale, de Íon de Quios (c. 484-422 aC), é uma representação dramática do mito de Héracles e da rainha lídia Ônfale. Uma discussão do mito e tradução dos fragmentos foram já publicados; nesta segunda parte do artigo, o contexto dos fragmentos e sua posição na estrutura dramática são brevemente comentados. Evidências textuais sugerem que o transvestismo de Héracles, mencionado com frequência do final do Período Helenístico em diante, estava já presente neste drama satírico do Período Clássico.

Colloquium 4 Plato’s Statesman and the Nature of Philosophical Writing

Abstract The Visitor’s inquiry into the expertise of statesmanship in Plato’s Statesman consistently privileges knowledge as the sole source from which to derive legitimate authority to command. And yet the section of the dialogue to which he refers as a “play” (δρᾶμα, 303c8) of satyrs and centaurs (291a–303d) complicates matters significantly by spelling out the difficulty of identifying a true statesman and the dangers of thinking ourselves able to do so. Reading the account of human community provided in the myth of the cosmos together with the “good imitation” of knowledge in the satyr play, a limited notion of properly human wisdom comes into view as the horizon within which to interpret knowledge and dialectical division in the dialogue. I conclude that the education of the dialectician is connected to the problem of the absence of the true statesman, and that the Statesman is prescribing ways in which members of the philosophical community ought to understand themselves in dialogue with the written word.

Heterodyne performance and characteristics of terahertz MgB2 hot electron bolometers

We have studied THz heterodyne detection in sub-micrometer MgB2 hot electron bolometer (HEB) mixers based on superconducting MgB2 films of ∼5nm (HEB-A), corresponding to a critical temperature (Tc) of 33.9 K, and ∼7nm (HEB-B), corresponding to a Tc of 38.4 K. We have measured a double sideband (DSB) receiver noise temperature of 2590 K for HEB-A and 2160 K for HEB-B at 1.6 THz and 5 K. By correcting for optical losses, both HEBs show receiver noise temperatures of ∼1600 K referenced to the front of anti-reflection (AR)-coated Si lenses. An intermediate frequency (IF) noise bandwidth of 11 GHz has been measured for both devices. The required local oscillator (LO) power is about 13 μW for both HEBs. We have also measured a DSB receiver noise temperature of 3290 K at 2.5 THz and 5 K but with an AR-coated lens optimized for 1.6 THz. Besides, we have observed a step-like structure in current voltage (IV) curves, which becomes weaker when the LO power increases and observable only in their differential resistance. Such a correlated structure appears also in the receiver output power as a function of voltage, which is likely due to electronic inhomogeneities intrinsic to the variations in the thickness of the MgB2 films. Different behavior in the IV curves around the low bias voltages, pumped with the same LO power at 1.6 and 5.3 THz, was observed for HEB-B, suggesting the presence of a high-energy σ-gap in the MgB2 film.

A High-Power Terahertz Source Over 10 mW at 0.45 THz Using an Active Antenna Array With Integrated Patch Antennas and Resonant-Tunneling Diodes

We propose a compact, high-power, and high-directivity surface-emitting terahertz (THz) source based on an array of active antennas with integrated patch antennas and resonant-tunneling diodes (RTDs). An array configuration of active antennas, each with an integrated patch antenna and two RTDs and coupled by microstrip lines, enables spatial power combining and improves directivity through coherent oscillation. We confirmed a maximum radiation power of 11.8 mW in a prototype 6 × 6 array at an oscillation frequency of 0.45 THz. Parasitic oscillation at low frequencies was suppressed by use of a bias stabilization circuit consisting of series-connected resistors and capacitors, and the dc to RF efficiency of this device was estimated to be approximately 1%. The radiant intensity of 210 mW/sr and the 3-dB beamwidth of 13° for the measured 6 × 6 array confirmed that directivity was improved by coherent oscillation based on mutual injection locking. The directivity of the patch antenna capable of surface emission can be controlled only by the number of antennas, even if there is no secondary radiator, such as an Si lens. The obtained results suggest that RTDs are promising as practical THz sources for realizing applications of THz imaging and 6G communication.

A 200 GHz Fully Integrated, Polarization-Resolved Quasi-Optical Detector Using Zero-Bias Heterostructure Backward Diodes

We report the design, fabrication, and prototype demonstration of a 200-GHz polarization-resolved quasi-optical detector employing monolithically integrated zero-bias heterostructure backward diodes (HBDs). In this design, polarization resolution is achieved by orthogonally integrating the detectors with a planar dual-polarization annular-slot antenna. The detector chip was fabricated and mounted on an extended hemispherical Si lens to enhance antenna efficiency in the millimeter-wave to terahertz region. The responsivity and radiation patterns of the detector were characterized experimentally; good agreement with theoretical calculations was obtained. By measuring the outputs of two orthogonal HBDs as a function of the polarization angle of the incident wave, the planar detector detects intensity and resolves polarization. On the basis of the polarimetric measurement, we further demonstrate the polarization imaging capability of the proposed detector by using it as an imaging system. The detector is promising for developing terahertz polarimetric sensors and imaging arrays in chemical sensing, biomedical imaging, and radio astronomy applications.

Of centaurs and satyrs: Stesichorus' Geryoneis and satyr drama

Of centaurs and satyrs: Stesichorus' Geryoneis and satyr drama

Low noise MgB2 hot electron bolometer mixer operated at 5.3 THz and at 20 K

We have demonstrated a low noise superconducting MgB2 hot electron bolometer (HEB) mixer working at the frequency of 5.3 terahertz (THz) with 20 K operation temperature. The bolometer consists of a 7 nm thick MgB2 submicrometer bridge contacted with a spiral antenna to couple THz radiation through a high resistive Si lens, and it has a superconducting critical temperature of 38 K. By using hot/cold blackbody loads and a Mylar beam splitter all in vacuum and applying a 5.25 THz far-infrared gas laser as a local oscillator, we measured a minimal double sideband receiver noise temperature of 3960 K at the LO power of 9.5 μW. This can be further reduced to 2920 K if a Si lens with an antireflection coating optimized at this frequency and a 3 μm beam splitter are used. The measured intermediate frequency (IF) noise bandwidth is 9.5 GHz. The low noise, wide IF bandwidth mixers, which can be operated in a compact, low dissipation Stirling cooler, are more suitable for space applications than the existing HEB mixers. Furthermore, we likely observed a signature of the double-gap in MgB2 by comparing current–voltage curves pumped at 5.3 and 1.6 THz.

THE RETURN OF THE PIPERS: IN SEARCH OF NARRATIVE MODELS FOR THEAITIONOF THEQVINQVATRVS MINVSCVLAE

AbstractThe article argues that the famous story about the strike, exile and return of the Romanaulosplayers, which is recorded in the sixth book of Ovid'sFastiand referred to by other Latin and Greek sources, is based on a narrative model that already existed in Greece in the Archaic period. The study draws parallels between the tale of the pipers and the myth of the return of Hephaestus to Olympus, suggesting that, apart from similar plots, the two stories share many motifs, such as references to themes derived from comedy and satyr drama. Searching for a possible channel of transmission of the story from Archaic Greece to Augustan Rome, the study explores the presence of satyric motifs in Etruscan vase-painting and Roman processional rites. It is furthermore emphasized that many of these motifs, which also appeared in lost satyr-plays, are echoed in Augustan poetry.

Raman Scattering Study on the Influence of E-Beam Bombardment on Si Electron Lens.

Microcolumns have a stacked structure composed of an electron emitter, electron lens (source lens), einzel lens, and a deflector manufactured using a micro electro-mechanical system process. The electrons emitted from the tungsten field emitter mostly pass through the aperture holes. However, other electrons fail to pass through because of collisions around the aperture hole. We used Raman scattering measurements and X-ray photoelectron spectroscopy analyses to investigate the influence of electron beam bombardment on a Si electron lens irradiated by acceleration voltages of 0, 20, and 30 keV. We confirmed that the crystallinity was degraded, and carbon-related contamination was detected at the surface and edge of the aperture hole of the Si electron lens after electron bombardment for 24 h. Carbon-related contamination on the surface of the Si electron lens was verified by analyzing the Raman spectra of the carbon-deposited Si substrate using DC sputtering and a carbon rod sample. We report the crystallinity and the origin of the carbon-related contamination of electron Si lenses after electron beam bombardment by non-destructive Raman scattering and XPS analysis methods.

De Aeschyli Amymona satyrica

The paper offers a survey of Aeschylus’ satyr drama Amymone, which was staged probably in 463 BC together with the trilogy of the Danaids. After discussion on the argument of the play and its possible reconstruction, the three surviving fragments are presented with critical text, Latin translation and thorough commentary.

‘A Perfectly Self-Contained Tetralogy’: Mahler’s Tragicomic Inspirations

AbstractThis article examines Mahler’s Fourth Symphony and its role in what the composer called his ‘perfectly self-contained tetralogy’. Previous explanations for this phrase include the first four symphonies’ shared song quotations and ideological content, but the dramas of ancient Dionysian festivals present a better model: three serious tragedies and a comic satyr play, a performance grouping also known as a ‘tetralogy’. Following Mahler’s first three symphonies (his ‘Trilogie der Leidenschaft’), the Fourth Symphony – originally entitled ‘Humoreske’ – is compared to a light-hearted satyr play, featuring abrupt juxtapositions of moods and a setting of the humorous song ‘Das himmlische Leben’. Praise for the redemptive effects of this ancient tragicomic juxtaposition plays an important role in Nietzsche’s The Birth of Tragedy, and the importance of humour especially shaped the philosopher’s later writings, many of which Mahler knew from his time as a student in Vienna. This new reading not only provides a better explanation for Mahler’s comment, but also illustrates Nietzsche’s influence on the composer’s sense of drama.

El coro satírico y su función en las tramas satíricas esquileas. Notas sobre la gestualidad del coro y el rol actancial de Sileno en Arrastradores de redes

El presente artículo intenta mostrar algunos aspectos del rol dramático y la función escénica del coro en la producción satírica de Esquilo, específicamente en el Fr. 47 a R, versos 821-832. La hipótesis del trabajo sostiene que este canto coral debe entenderse en dependencia de la anterior canción de Sileno, versos 802-820, par estrófico con el cual muestra una evidente relación temática de complementariedad. Desde el punto de vista escénico, la imbricación del Coro en la trama satírica es directa, al punto que asume un rol actancial que posibilita un esquema de integración y separación de Sileno en el acción coral alternando como corifeo y actor.
 La interacción entre ambos pasajes líricos no solo se constataría en la temática y en la lengua sino también en la gestualidad del coro, respecto de lo cual se propone entender algunos indicadores gestuales que permiten organizar la escena.

Semantic and Pragmatic Presuppositions in Postmodern Text

The article suggests the analysis of literary texts based on the linguistic theory of presuppositions, which is considered to be one of the possible promising approaches to interpreting implicit levels of literary text. The use of this approach is expected to be effective at various communication levels: character-character, narrator-reader, author-reader. The authors use the method of discourse analysis to study the different types of presuppositions and their functioning not only within isolated abstract expressions, but as a part of a broad cultural context. Linguistic methods are combined with a philological method of text interpretation and an intertextual approach, of being subject to consider a random expression in the context of the literary work as a whole. The analysis of presuppositions specificity in the text and the ways of its explication are based on the theory of presuppositions. The methodology of the analysis focuses on identifying presuppositions to establish dominant semantic categories and systemic interaction between them, constituting the artistic picture of the world in Pelevin’s story as a postmodern writing code. Study of the text the presuppositions level helps to clarify the architectonics of the postmodern literary text and to define the ideological constants forming the semantic field of comprehension. The main positions in Pelevin's work are occupied by such semantic categories as ‘cosmology’, ‘religion’, ‘society’, ‘science’, ‘art’, etc. Their analysis allowed to formulate a meta-subject of postmodern text, which can be defined as ‘rite de passage’. Pelevin's story is viewed in the context of the dialogue between modernism realized the exhaustion of modern culture, and postmodernism accepted this situation as a given and played the fate tragedy as satyr drama in the best traditions of the ancient theatre: where the modernist hero dies, the postmodernist marginal is able to overcome an irresistible edge.

A superconducting flux-flow oscillator of terahertz range

We have elaborated, fabricated and tested a THz source radiating to open space based on the superconducting flux-flow oscillator (FFO). In this concept, the oscillator is integrated with the transmitting lens antenna based on a slot structure in Nb film with a thickness of ~200 nm located on the same chip. The slot planar antenna is matched to the oscillator (by input) and to the semielliptical Si lens with a diameter of 10 mm (by output) providing a narrow output beam of THz emission. A harmonic mixer based on the superconductor-insulator-superconductor junction embedded in the “FFO and antenna” integrated structure has been used for the phase locking of the oscillator. Several designs of antenna coupled with the oscillator by microstrip lines have been numerically simulated, and the batches of experimental samples based on Nb-AlN-NbN superconducting trilayers with Rn ·A ~ 20 Ω·μm2 (jc ~ 10 kA/cm2) have been fabricated and tested. Two different setups were used for experimental study: a THz spectrometer based on the SIS receiver with a high spectral resolution (better than 0.1 MHz) and a Si bolometer. The overall operating range of 250 to 700 GHz is covered by all the developed designs.

Satyrs, spirits, and Dionysian intemperance in Shakespeare’s Tempest

The article focuses on the rebellious subplot of William Shakespeare’s The Tempest that forms around Caliban, Stephano, and Trinculo, and reads it as a satyr play. Demonstrated is how the Dionysian subplot stands in close analogical connection with the play’s main action. It is also argued that the storyline emphasises a dimension of the play that is of high relevance to the analysis of its metatheatrical implications. The correspondences between the main action and the satyr play elements highlight the important role that intemperance, excess and the suspension of control play in the Shakespearean theatrical setting.

Tragic Greek Wisdom and Young Kohut’s Empathic Understanding

ABSTRACTMy comments add some points for reflection and open-ended questions rather than a structured and exhaustive discourse to Dr. Dobson’s fascinating exploration of quite unknown aspects of Kohut’s personal experience and thought. Recalling Kohut’s essays on Courage and on Leadership I emphasize his open mind conception of simultaneous existence of different and even contradictory selves in the same person. I address the differences between the Odysseus of Homer, with his epic vision, and the Odysseus of Euripides, in his version of the satyr play. I also underscore that Kohut’s early choice to focus on a satyr play can glimpse Kohut’s curious mentality and openness to a non-linear and non-conformist way of thinking that brought so much vitality into self psychology and psychoanalysis. Kohut understood that, at certain historical moments, there may exist a dangerous narcissistic imbalance in large segments of a country’s population. I connect this intuition with Arendt’s reflections on totalitarianism.