” Nature highlights a recent ACS Photonics study on a novel reconfigurable lens”
In constant search for miniaturizing commercial optical devices, integrated micro-optical elements play a central role in the development of applications that aim to improve high-density data storage and imaging. Until now, such devices presented the drawback of fine aligning and adjusting the focus through mechanically operations, therefore, limiting their accuracy, size and speed.
Continue reading “An adaptive plasmonic lens”
Nowruz (Persian: نوروز, IPA: [nouˈɾuːz], meaning “[The] New Day”) is the name of the Iranian New Year. Nowruz marks the first day of spring or Equinox and the beginning of the year in the Persian calendar.
The dependence of the output power on the delay indicated that the generated pulse length was less than a picosecond, which suggested an extremely high direct-modulation rate. Moreover, finer interferometric measurements of the spectral composition of the radiation allowed the authors to establish that the generated pulse was even shorter; on a subpicosecond scale. Thus, this spaser has more than a terahertz in the direct modulation bandwidth — a record-setting achievement.
Continue reading “Plasmonic lasers: On the fast track”
Nanosphere lithography (NSL), originally termed ‘ natural lithography’ by its inventors,1 is becoming a widespread bottom-up technique to pattern solid surfaces at the sub-micrometer and nanoscales. Groups such as Van Duyne’s2 at Northwestern University and others3 undertook pioneering work on NSL in the 1990s and early this decade, and a growing number of research laboratories around the globe now use the technique in many scientific disciplines. The approach has applications in various materials systems, is fast and scalable to large surface areas, and is inexpensive in terms of equipment and operation. Some variants of the technique have reached a high level of maturity and control. Therefore, it is likely that it will soon be used in device fabrication.
Continue reading “Nanosphere lithography for device fabrication”
AUSTIN, Texas — A team of researchers at The University of Texas at Austin’s Cockrell School of Engineering has built the first-ever circulator for sound. The team’s experiments successfully prove that the fundamental symmetry with which acoustic waves travel through air between two points in space (“if you can hear, you can also be heard”) can be broken by a compact and simple device.
Continue reading “UT Austin Engineers Build First Nonreciprocal Acoustic Circulator: A One-Way Sound Device”
In January 2015, Shukla et al., from department of physics and materials science and engineering of India have proposed a surface plasmon resonance (SPR) based fiber optic sensor with bi layers of metal–ZnO.
Continue reading “Sensitivity enhancement of a surface plasmon resonance based fiber optic sensor using ZnO thin film”