Germanium charge-coupled devices for hard x-ray astronomy

Leitz, Christopher; Donlon, Kevan; Young, Douglas; Lambert, Renee D.; Collins, Michael; Burke, Barry E.; Zhu, Meng; Rabe, S.; Cooper, Michael; O'Mara, Daniel M.

doi:10.1117/12.2562583

Cited by 2 publications

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“…Although many such searches have been proposed, none have yet been experimentally realized. While a CCD-type detector made from a narrow-gap semiconductor is certainly a theoretical possibility, the practical difficulties of obtaining a working CCD from any materials but silicon (and to a lesser extent, germanium [239,240]) make this approach unlikely to succeed in the short term. An alternative approach is direct charge amplification from impact ionization, where a charge drifted at high voltage can collisionally excite other charges from the valence to the conduction band.…”

Section: Experiment: Towards Low Thresholds and Dark Ratesmentioning

confidence: 99%

Searches for light dark matter using condensed matter systems

Kahn

Lin

2022

Rep. Prog. Phys.

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Identifying the nature of dark matter (DM) has long been a pressing question for particle physics. In the face of ever-more-powerful exclusions and null results from large-exposure searches for TeV-scale DM interacting with nuclei, a significant amount of attention has shifted to lighter (sub-GeV) DM candidates. Direct detection of the light dark matter in our galaxy by observing DM scattering off a target system requires new approaches compared to prior searches. Lighter DM particles have less available kinetic energy, and achieving a kinematic match between DM and the target mandates the proper treatment of collective excitations in condensed matter systems, such as charged quasiparticles or phonons. In this context, the condensed matter physics of the target material is crucial, necessitating an interdisciplinary approach. In this review, we provide a self-contained introduction to direct detection of keV–GeV DM with condensed matter systems. We give a brief survey of dark matter models and basics of condensed matter, while the bulk of the review deals with the theoretical treatment of DM-nucleon and DM-electron interactions. We also review recent experimental developments in detector technology, and conclude with an outlook for the field of sub-GeV DM detection over the next decade.

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Section: Experiment: Towards Low Thresholds and Dark Ratesmentioning

confidence: 99%

Searches for light dark matter using condensed matter systems

Kahn

Lin

2022

Rep. Prog. Phys.

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“…CCD is widely used in imaging, remote sensing, laser radar, and many other aspects. [2][3][4][5] High-performance photoelectric devices often rely on susceptible CCD devices. However, these susceptible devices are easily interfered with by high-power light.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled CsPbBr3 quantum nanosheet for optical reconnaissance satellite active jamming

Chen

Zhang

et al. 2023

Earth and Space: From Infrared to Terahertz (ESIT 2022)

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With the increasing frequency of space activities, space satellite systems are fully involved in joint operations. Numerous imaging and reconnaissance optical imaging satellite systems are arduous to evade and warn actively, and passive protection is cumbersome to implement. Therefore, developing new reflective imaging satellite reconnaissance systems and materials is particularly important. In countering optical imaging satellites, active jamming materials can form aerosol jamming smoke screens on the action path of the target to be protected. The jamming signal transmitted in all directions can suppress the imaging accuracy of the optical satellite to the target and form an effective deception. CsPbBr3 perovskite quantum dots show great potential in anti-detection and active jamming due to their high absorption and emission efficiency, size-dependent excellent photoelectric properties, and low exciton binding energy. However, it is still challenging to synthesize CsPbBr3 nanosheets with wide band emission for active interference. This paper uses the template induction method to regulate the morphology of the CsPbBr3 crystal. CsPbBr3 nanospheres and nanocubes were synthesized by the recrystallization method. CsPbBr3 nanospheres were induced to self-assemble on CsPbBr3 nanocubes to synthesize CsPbBr3 nanosheets with wideband emissions. It maintained a strong quantum confinement effect, a simple synthesis process, high stability, and excellent photoelectric performance. The induced synthesis process was recorded by field emission transmission electron microscope. The nanosheets were face-to-face, close, and perpendicular to the carbon film substrate. The balance of van der Waals force and elastic repulsion force between ligands under thermodynamics determines the lamellar spacing of nanosheets in the self-assembled state. UV-Vis absorption spectra further proved the change of morphology during self-assembly. The nanosheets were also very stable under 200kV electron beam bombardment. The fast Fourier transform patterns of the nanosheet demonstrated that the assembled NCs were orthogonal, with no crystal transition in the assembly process. X-ray photoelectron spectroscopy showed that the crystal is composed of CS, Pb, and Br elements. The assembly process did not change the ion state and element composition on the surface and inside. The photoluminescence spectrum showed that the emission wavelength of the nanosheets was 493nm, and a uniformly tunable emission wavelength was generated between 468-506nm. The disappearance of the tail band in the long wavelength region demonstrated that the defects in the self-assembly process were significantly reduced. The quantum yield increased from 65.78% to 67.33%, which directly confirmed that the large absorption cross section and defect reduction brought by the unique sheet structure were conducive to the conversion of excitation light in the active

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Germanium charge-coupled devices for hard x-ray astronomy

Cited by 2 publications

References 0 publications

Searches for light dark matter using condensed matter systems

Searches for light dark matter using condensed matter systems

Self-assembled CsPbBr3 quantum nanosheet for optical reconnaissance satellite active jamming

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