{"id":2002,"date":"2010-07-14T10:25:04","date_gmt":"2010-07-14T14:25:04","guid":{"rendered":"https:\/\/wpmu2.mit.local\/?p=2002"},"modified":"2010-08-18T10:01:36","modified_gmt":"2010-08-18T14:01:36","slug":"ultra-fast-laser-modulation-mediated-by-strong-light-matter-coupling","status":"publish","type":"post","link":"https:\/\/wpmu2.mit.local\/ultra-fast-laser-modulation-mediated-by-strong-light-matter-coupling\/","title":{"rendered":"Ultra-fast Laser Modulation Mediated by Strong Light-matter Coupling"},"content":{"rendered":"
\"Figure<\/a>

Figure 1: Device structure and diagram of experimental setup.<\/p><\/div>\n

Optical computing has the potential to create a paradigm shift in the way information is transmitted and manipulated by creating all-optical data networks and computational circuits with almost unlimited bandwidth and unprecedented energy-ef\ufb01ciency. However, this long-standing dream has thus far been dif\ufb01cult to achieve due to a lack of appropriate material sets, light-matter interactions, and device design necessary to create the optical components that are fast, highly energy-ef\ufb01cient, and capable of being integrated into a larger photonic system. Here we present a micron-scale laser structure with output that is modulated at THz frequencies and with ultra-low energies. The lasing medium emission from the cavity is modulated by the presence of a highly absorptive J-aggregate material that is strongly coupled to the cavity [1<\/a>]<\/sup> [2<\/a>]<\/sup>. The devices consist of a dielectric mirror, followed by a thermally evaporated layer of the dye DCM (the lasing material) and a 5-nm J-aggregate thin film that is resonantly coupled to the cavity. The cavity is capped with a thermally evaporated silver mirror. The structure is shown in Figure 1.<\/p>\n

\"Figure<\/a>

Figure 2: Dispersion of the lasing emission of the cavity.<\/p><\/div>\n

The cavity is excited non-resonantly with 150-fs pulses (from the pump), which causes lasing emission from the DCM at 600 nm. The emission shows an unusual conical dispersion pattern (Figure 2a) due to the strongly-coupled J-aggregate material in the cavity. A second (gate) pulse, which is resonant with the J-aggregate absorption, is delivered to the sample at a variable time relative to the pump pulse. Upon the excitation of the J-aggregate layer with the gate pulse, the lasing emission is quenched up to 25% (Figure 2b). The modulation of the lasing output occurs only when the pump-gate pulse delay is < 1 ps, permitting operating frequencies of up to 1 THz. The gate pulse energy density required for modulation was ~ 1 fJ\/\u00b5m2<\/sup>. This micro-scale laser modulator is a demonstration of a potentially new class of organic-based, low-power, ultra-fast photonic circuit components. Currently, the role of strong light-matter coupling in the modulation of the lasing is being investigated.<\/p>\n

\r\nReferences
  1. M. S. Bradley, J. R. Tischler, and V. Bulovic, \u201cLayer-by-layer J-aggregate thin films with a peak absorption constant of 10(6) cm(-1),\u201d Advanced Materials<\/em>, vol. 17, pp. 1881-1886, 2005. [↩<\/a>]<\/li>
  2. Tischler et al. \u201cSolid state cavity QED: Strong coupling in organic thin films,\u201d Organic Electronics<\/em>, vol. 8, pp. 94-113 (2007). [↩<\/a>]<\/li><\/ol><\/div>","protected":false},"excerpt":{"rendered":"

    Optical computing has the potential to create a paradigm shift in the way information is transmitted and manipulated by creating…<\/p>\n<\/div>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[12],"tags":[4156,46],"_links":{"self":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/2002"}],"collection":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/comments?post=2002"}],"version-history":[{"count":3,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/2002\/revisions"}],"predecessor-version":[{"id":2362,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/2002\/revisions\/2362"}],"wp:attachment":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/media?parent=2002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/categories?post=2002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/tags?post=2002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}