منابع مشابه
Multiscale optics for enhanced light collection from a point source.
High-efficiency collection of photons emitted by a point source over a wide field of view (FoV) is crucial for many applications. Multiscale optics offer improved light collection by utilizing small optical components placed close to the optical source, while maintaining a wide FoV provided by conventional imaging optics. In this work, we demonstrate collection efficiency of 26% of photons emit...
متن کاملNon-linear graphene optics for terahertz applications
The linear electrodynamic properties of graphene – the frequency-dependent conductivity, the transmission spectra and collective excitations – are briefly outlined. The non-linear frequency multiplication effects in graphene are studied, taking into account the influence of the self-consistent-field effects and of the magnetic field. The predicted phenomena can be used for creation of new devic...
متن کاملMultilevel silicon diffractive optics for terahertz waves
A multilevel microfabrication process has been developed to produce silicon Fresnel lenses for terahertz waves. A repeated binary fabrication process was used to create lenses with up to eight levels in complexity and these lenses have been compared to both less complex structures and refractive optic lenses. The microfabrication required deep reactive ion etching and multilevel resist processi...
متن کاملSemiconductor lasers: Monolithic terahertz source
Twisted relativistic light pulses with a strong torque and an ultrahigh orbital angular momentum density can in principle be created by shining light pulses onto a specially design thin metal foil, report scientists in China. Theoretical analysis and simulations by Yin Shi and co-workers at the Shanghai Institute of Optics and Fine Mechanics predict that when intense pulses with planar wavefron...
متن کاملAn Anti-Reflection Coating for Silicon Optics at Terahertz Frequencies
A method for reducing the reflections from silicon optics at terahertz frequencies has been investigated. In this study, we used thin films of parylene as an anti-reflection (AR) layer for silicon optics and show low-loss behavior well above 1 THz. Transmittance spectra are acquired on double-sided-parylene-coated, high-resistivity, single-crystal silicon etalons between 0.45 THz and 2.8 THz. M...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Applied Physics Letters
سال: 1988
ISSN: 0003-6951,1077-3118
DOI: 10.1063/1.99971