T rays technology in future scanners
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Terahertz radiation lies between infrared and microwave bands in the electromagnetic spectrum. New technologies are being developed to generate terahertz waves using nano-antennas and room temperature sources for applications such as scanners. Existing scanners are bulky, expensive, and complex but future scanners could be smaller, portable, and lower cost using nano-antennas that efficiently emit terahertz waves to scan for materials like explosives and cancer tumors.
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Ldb Convergenze Parallele_sorba_01
This document provides an overview of the Institute of Nanoscience and its research activities related to semiconductor nanostructures and their applications. The institute has over 250 researchers studying the fundamental properties and manipulation of nanoscale systems through synthesis, fabrication, experimental and theoretical studies of nanostructures and devices. Key areas of research include semiconductor nanowires for applications in electronics, optoelectronics and spintronics. Heterostructured nanowires of InAs, InSb and InP are investigated for high mobility transistors and terahertz detectors. Strain-driven self-assembly is used to create 3D nanostructures for applications in sensing, energy harvesting and photonics.
Introduction of nmr
The document discusses nuclear magnetic resonance (NMR) spectroscopy. It describes the key components of an NMR instrument, including the superconducting magnet, RF generator, sample probe, and electronics for data processing. Modern NMR spectrometers use powerful superconducting magnets that require liquid helium to maintain the coils in a superconducting state. Shim coils are used to correct for minor field inhomogeneities. The sample is dissolved and placed in a glass tube within the probe. The probe contains RF coils and systems to spin and temperature control the sample. Fourier transform NMR provides sensitivity improvements over continuous wave instruments.
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This document discusses advancements in photomixing and photoconductive switching devices for terahertz spectroscopy and imaging. It reviews the design methodology and applications of photomixers and photoconductive switches. Photomixers are being used in broadly tunable sweep oscillators and coherent transceivers for high-resolution spectroscopy. Photoconductive switches are used in time-domain spectrometers and illuminators for terahertz impulse radars. Both device types have advantages like broad bandwidth but differ in average power output, with switches producing higher power on average. Careful design of these ultrafast photoconductive devices is important for optimizing their performance and applications.
Dendrimer based terahertz time-domain spectroscopy and applications in molecu...
Dendrimer based terahertz time-domain spectroscopy and applications in molecu...Applied Research and Photonics, Inc.
Electro-optic Dendrimer is used to generate milliwatts of terahertz power by difference frequency
method. A terahertz time-domain spectrometer (THz-TDS) has been designed around this source that
exhibits wide broadband terahertz range, 0.1 to 35 THz. Examples of molecular characterization are discussed
for three common explosives and the vibrational states of Fullerenes. The explosives’ spectra are
unique for each explosive that allow detection and identification of the species. The Fullerenes C60 and
H2@C60 also exhibit distinctively different spectra and absorbance states indicating that the THz-TDS is
suitable for probing increased number of vibrational states expected from molecular vibrations.
2011 Elsevier B.V. All rights reserved.Introduction to Mobile Computing ppt1.ppt
Wireless communication transfers information between devices without a physical connection using electromagnetic waves across the electromagnetic spectrum. Wireless signals are transmitted using antennas and received by antennas connected to other devices. The electromagnetic spectrum ranges from long radio waves to short gamma rays, with different frequencies and wavelengths used for different wireless technologies. Common uses of the electromagnetic spectrum include radio, GPS, WiFi, radiation therapy, and X-rays.
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T rays technology in future scanners
- 1. T-RAYS TECHNOLOGY IN FUTURE SCANNERS By:- Amit Ranjan
- 2. INTRODUCTION Terahertz radiation refers to electromagnetic waves propagating at frequencies in the terahertz range. Terahertz waves lie at the far end of the infrared band, just before the start of the microwave band. The T-ray band lies between 0.1 and 10 terahertz (THz).
- 3. T-rays, bridge the gap between electronics and photonics, have novel properties and interact uniquely with many materials.
- 4. BACKGROUND Terahertz radiation is emitted as part of the black body radiation from anything with temperatures greater than about 10 kelvin. mid-2007:- scientists at the U.S. Argonne National Laboratory announced the creation of a compact device that can lead to portable battery-operated sources of terahertz radiation which uses high-temperature superconducting crystals. In 2008, engineers at Harvard University demonstrated that THz radiation was generated by nonlinear mixing of two modes in a mid-infrared quantum cascade laser. In 2009, T-waves are produced when unpeeling adhesive tape. The mechanism of terahertz radiation is tribocharging of the adhesive tape and subsequent discharge. In 2011, Japanese electronic parts maker Rohm and a research team at Osaka University produced a chip capable of transmitting 1.5 Gbps using terahertz radiation. In 2012 scientists from IMPERIAL COLLEGE LONDON and A*STAR in SINGAPORE have shown off a tera hertz antenna that is just 100 nanometers across- about
- 5. High-temperature superconducting crystal Schematic of the terahertz- source, which was fabricated on the top of an atomically layered super conducting crystal (Credit: Argonne National Laboratory) It's enough to apply a voltage of 2 millivolts per junction to the crystals to induce electromagnet fields of frequencies in the terahertz range.
- 6. T-RAYS SCANNERS Present T-rays scanners used at airports
- 7. Drawbacks of old scanners: BULKY EXPENSIVE NOT PORTABLE COMPUTING IS COMPLEX Not familier with room temprature LARGE IN SIZE
- 8. High-performance terahertz sources based on plasmonic photoconductors
- 9. EMISSION of TERAHERTZ RAYS through NANO-ANTENNA The tip-to-tip nanogap electrode structure provides strong terahertz field enhancement and acts as a nano-antenna to radiate the terahertz wave generated in the active region of the photomixer.
- 10. Structure of Nano-Antenna highly efficient continuous-wave terahertz emission using nanogap electrodes in a photoconductive antenna-based photomixer.
- 11. Advantages of nano- antenna Operates at room temprature sense molecules such as those present in cancerous tumours and living DNA, Portable Smaller in size lower RC time constant Allow efficient radiation at higher part of the terahertz spectrum
- 12. Refrences: 1.Nature Photonics 6, 121–126 (2012), http://www.nature.com/nphoton/journal/v6/n2/full/nphoton.201 1.322.html 2. Imperial college ,london NEWS and EVENTS, jan 2012 http://www3.imperial.ac.uk/newsandeventspggrp/imperialcolle ge/newssummary/news_20-1-2012-15-50-15 3.http://www.extremetech.com/computing/114975-nano-scale- terahertz-antenna-created-hand-held-tricorders-incoming 4. Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore 117602 H. Tanoto,J. H. Teng,Q. Y. Wu, B. Wang , C. C. Chum 5. terahertz radiation wilkkipidiahttp://en.wikipedia.org/wiki/Terahertz_radiation 6. Article in Nature 14 November 2002 (local copy from the Jefferson Lab) 7 photomixing