BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/London BEGIN:DAYLIGHT DTSTART:20230326T020000 TZOFFSETFROM:+0000 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:BST END:DAYLIGHT BEGIN:STANDARD DTSTART:20221030T010000 TZOFFSETFROM:+0100 TZOFFSETTO:+0000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:GMT END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20241219T010308Z UID:6482DB2D-261E-498B-B0DF-BD7AE58A28CD DTSTART;TZID=Europe/London:20230324T150000 DTEND;TZID=Europe/London:20230324T160000 DESCRIPTION:Photonic cavities can be high-finesse\, confining photons for v ery long times\, but due to the diffraction limit usually have large mode volumes. On other hands\, nanoplasmonic cavities achieve extremely sub-wav elength mode volumes that allowed us to bring strong-coupling at room temp erature\, but are very lossy (both radiative and material losses). In this talk I will present our work on two very different nanophotonic cavities( i) a nanoplasmonic cavities formed by tightly-coupling two nanometallic st ructures and (ii) a high-finesse photonic crystal cavity that also achieve s sub-wavelength mode volumes. Plasmonic nanocavities have the ability to significantly confine and enhance light\, while at the same time efficient ly radiate energy to the far-field. Due to these properties\, unprecedente d light-matter interactions have been realised at room temperature\, such as light-matter strong-coupling. In this talk\, I will first explain how t he strong-coupling regime is achieved in these systems. I will also presen t the complex set of plasmonic modes supported by extreme plasmonic nanoan tennas\, their impact on the excitation and radiative properties of the an tenna and how geometrical symmetries dominate their behaviour. Furthermore \, when multiple quantum emitters are placed within plasmonic nanocavities sub-radiant entangled states emerge that are long-lived. However\, Rabi o scillations do not survive for long periods of time in plasmonic nanocavit ies\, due to their high losses. A high-finesse cavity on the other hand\, retains photons within the cavity for long times. I will present photonic crystal waveguide designs that are both high-finesse (Q=10^7) and achieve sub-wavelength mode volumes (V~0.6\\lamba^3). Our new designs operate at 7 80nm to couple with cold atoms\, and easily reach deep within the strong c oupling regime to form an ideal environment to realise quantum entanglemen t. Through the entropy dynamics of two emitters we demonstrate local multi -partite entanglement\, which is very robust to atomic displacements. Such photonic cavity designs are easily scaled-up to construct large quantum n etworks with both local and global entanglement.\n\nVirtual: https://event s.vtools.ieee.org/m/413081 LOCATION:Virtual: https://events.vtools.ieee.org/m/413081 ORGANIZER:Hasan.Abbas@glasgow.ac.uk SEQUENCE:5 SUMMARY:Light-matter strong coupling in extreme nanophotonic cavities URL;VALUE=URI:https://events.vtools.ieee.org/m/413081 X-ALT-DESC:Description: <br /><p>Photonic cavities can be high-finesse\, co nfining photons for very long times\, but due to the diffraction limit usu ally have large mode volumes. On other hands\, nanoplasmonic cavities achi eve extremely sub-wavelength mode volumes that allowed us to bring strong- coupling at room temperature\, but are very lossy (both radiative and mate rial losses). In this talk I will present our work on two very different n anophotonic cavities(i) a nanoplasmonic cavities formed by tightly-couplin g two nanometallic structures and (ii) a high-finesse photonic crystal cav ity that also achieves sub-wavelength mode volumes. Plasmonic nanocavities have the ability to significantly confine and enhance light\, while at th e same time efficiently radiate energy to the far-field. Due to these prop erties\, unprecedented light-matter interactions have been realised at roo m temperature\, such as light-matter strong-coupling. In this talk\, I wil l first explain how the strong-coupling regime is achieved in these system s. I will also present the complex set of plasmonic modes supported by ext reme plasmonic nanoantennas\, their impact on the excitation and radiative properties of the antenna and how geometrical symmetries dominate their b ehaviour. Furthermore\, when multiple quantum emitters are placed within p lasmonic nanocavities sub-radiant entangled states emerge that are long-li ved. However\, Rabi oscillations do not survive for long periods of time i n plasmonic nanocavities\, due to their high losses. A high-finesse cavity on the other hand\, retains photons within the cavity for long times. I w ill present photonic crystal waveguide designs that are both high-finesse (Q=10^7) and achieve sub-wavelength mode volumes (V~0.6\\lamba^3). Our new designs operate at 780nm to couple with cold atoms\, and easily reach dee p within the strong coupling regime to form an ideal environment to realis e quantum entanglement. Through the entropy dynamics of two emitters we de monstrate local multi-partite entanglement\, which is very robust to atomi c displacements. Such photonic cavity designs are easily scaled-up to cons truct large quantum networks with both local and global entanglement.</p> END:VEVENT END:VCALENDAR