BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20220313T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20221106T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20221021T161626Z UID:8C0C6A53-63D4-4E89-8629-9447D7489793 DTSTART;TZID=America/New_York:20221019T130000 DTEND;TZID=America/New_York:20221019T140000 DESCRIPTION:The terahertz (THz) band\, often referred to the 0.3-10 THz fre quency range\, lies between the microwave and infrared regions of the elec tromagnetic spectrum. This frequency band is filled with numerous characte ristic spectral features associated with fundamental physical processes in cluding rotational transitions in molecules\, vibrational motions of organ ic compounds\, lattice vibrations in solid media\, intraband transitions i n semiconductors\, and energy gaps in superconductors. As such\, the devel opment of terahertz sources and detectors plays a pivotal role in the adva ncement of condensed matter physics\, biology and medical sciences\, globa l environmental monitoring\, metrology\, information and communication tec hnology. However\, the lack of access to suitable technologies across the 0.3-10 THz frequency range has led to the formation of a technological “ THz gap\,” hindering the facile and widespread use of THz waves in emerg ing applications. For the specific case of THz sources\, the general pract ice is to benefit from the advanced microwave technology to shrink the gap from the low-frequency side and employ established optical methods to ena ble radiation at the high-frequency end.\n\nIn this talk\, I will start wi th a concise survey of existing methods for the generation of THz waves an d will discuss existing challenges inherent to each technique\, from a mat erial as well as technological standpoint. Then I will introduce a new app roach for the generation of ultra-broadband\, ultra-compact\, and highly e fficient THz sources by employing the concept of hot-electron generation/t ransport in hybrid plasmonic platforms. We will discuss how the transport of hot-electrons at the interface of nanostructured metal electrodes and s emiconductors brings the best of conventional techniques together for the radiation of electromagnetic waves from 0.1 to 50 THz\, in a device as thi n as 75 nanometers. In the last part of the talk\, I will briefly explain viable approaches to capitalized on our new technique for the synthesis of terahertz waves with a desired electric-field pattern\, also known as str uctured THz field (i.e.\, vortexes and singularities)\, for the spectrosco py of quantum materials.\n\nSpeaker(s): Dr. Mohammad Taghinejad\, \n\nVirt ual: https://events.vtools.ieee.org/m/326466 LOCATION:Virtual: https://events.vtools.ieee.org/m/326466 ORGANIZER:sagarika.mukesh@gmail.com SEQUENCE:1 SUMMARY:Hot-Carrier Enabled Terahertz Radiation: A Sub-Nanometer Trip to th e Realm of Ultra-Broadband Sources URL;VALUE=URI:https://events.vtools.ieee.org/m/326466 X-ALT-DESC:Description: <br /><p>The terahertz (THz) band\, often referred to the 0.3-10 THz frequency range\, lies between the microwave and infrare d regions of the electromagnetic spectrum. This frequency band is filled w ith numerous characteristic spectral features associated with fundamental physical processes including rotational transitions in molecules\, vibrati onal motions of organic compounds\, lattice vibrations in solid media\, in traband transitions in semiconductors\, and energy gaps in superconductors . As such\, the development of terahertz sources and detectors plays a piv otal role in the advancement of condensed matter physics\, biology and med ical sciences\, global environmental monitoring\, metrology\, information and communication technology. However\, the lack of access to suitable tec hnologies across the 0.3-10 THz frequency range has led to the formation o f a technological &ldquo\;THz gap\,&rdquo\; hindering the facile and wides pread use of THz waves in emerging applications. For the specific case of THz sources\, the general practice is to benefit from the advanced microwa ve technology to shrink the gap from the low-frequency side and employ est ablished optical methods to enable radiation at the high-frequency end.&nb sp\;</p>\n<p>In this talk\, I will start with a concise survey of existing methods for the generation of THz waves and will discuss existing challen ges inherent to each technique\, from a material as well as technological standpoint. Then I will introduce a new approach for the generation of ult ra-broadband\, ultra-compact\, and highly efficient THz sources by employi ng the concept of hot-electron generation/transport in hybrid plasmonic pl atforms. We will discuss how the transport of hot-electrons at the interfa ce of nanostructured metal electrodes and semiconductors brings the best o f conventional techniques together for the radiation of electromagnetic wa ves from 0.1 to 50 THz\, in a device as thin as 75 nanometers. In the last part of the talk\, I will briefly explain viable approaches to capitalize d on our new technique for the synthesis of terahertz waves with a desired electric-field pattern\, also known as structured THz field (i.e.\, vorte xes and singularities)\, for the spectroscopy of quantum materials.</p> END:VEVENT END:VCALENDAR