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Express"],"published-print":{"date-parts":[[2026,6,29]]},"abstract":"<jats:p>\n                    We report the growth, fabrication, and characterization of resonant cavity interband                     cascade light-emitting devices (RCICLEDs), and compare their                     performance to the best previous results for midwave infrared (MW)                     LEDs and resonant cavity LEDs. A cavity with a high quality factor                     (&gt; 400) was realized by bonding the GaSb-based ICLED structure,                     with 20 stages divided into two groups placed at antinodes of the                     resonant cavity, to a GaAs-AlGaAs distributed Bragg reflector (DBR)                     with reflectivity &gt; 99%, and then depositing a single-period                     SiO\n                    <jats:sub>2<\/jats:sub>\n                    \/Ge DBR on top. Circular mesas were processed as                     full-cavity (with both top and bottom DBRs) and half-cavity (with only                     the bottom DBR) devices. Spectral characterization finds that the                     full-cavity RCICLED emits primarily within a narrow spectral resonance                     with a linewidth of 40\u2005nm centered on 4.47\u2005\u00b5m,                     which compares to \u2248 a 1000\u2005nm linewidth for a reference                     ICLED processed from a similar wafer without a resonant cavity. At a                     relatively low injection current density of 110 A\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , the                     total emittance from the full-cavity device is 0.91 W\/cm\n                    <jats:sup>2<\/jats:sup>\n                    ,                     while the portion contained within the cavity resonance is estimated                     as \u2248 0.64 W\/cm\n                    <jats:sup>2<\/jats:sup>\n                    . The present results are compared to                     the best previously-reported room-temperature values for emittance,                     wallplug efficiency, spectral bandwidth, and spectral intensity for MW                     LEDs and RCLEDs from the literature. For cw operation, the present                     half-cavity device displays higher emittance than any previous result                     for high-duty-cycle operation without an immersion lens at a                     wavelength longer than 3.3\u2005\u00b5m. The wallplug efficiency                     for the full-cavity device is higher than any previously-reported                     result for an MW RCLED operating under conditions that produce high                     spectral intensity, and it displays higher emittance, narrower                     linewidth, and higher spectral intensity than any previous device                     emitting at a wavelength longer than 3.3\u2005\u00b5m. We conclude                     that the present approach to narrow-band emission will be very                     attractive in applications like chemical sensing and infrared scene                     projection.\n                  <\/jats:p>","DOI":"10.1364\/oe.592336","type":"journal-article","created":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T13:00:10Z","timestamp":1773666010000},"page":"23252","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Resonant cavity interband cascade light-emitting devices operating beyond 4\u2005\u00b5m with high spectral intensity"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4146-8422","authenticated-orcid":true,"given":"Jeremy A.","family":"Massengale","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0065-5731","authenticated-orcid":true,"given":"Colin","family":"Iversen","sequence":"additional","affiliation":[{"name":"Praevium Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7270-2309","authenticated-orcid":true,"given":"Chul Soo","family":"Kim","sequence":"additional","affiliation":[{"name":"Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mijin","family":"Kim","sequence":"additional","affiliation":[{"name":"Amentum, 7740 Milestone Parkway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-1459-5113","authenticated-orcid":true,"given":"Chadwick L.","family":"Canedy","sequence":"additional","affiliation":[{"name":"Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0490-5256","authenticated-orcid":true,"given":"Igor","family":"Vurgaftman","sequence":"additional","affiliation":[{"name":"Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6528-6994","authenticated-orcid":true,"given":"Vijaysekhar","family":"Jayaraman","sequence":"additional","affiliation":[{"name":"Praevium Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7042-4659","authenticated-orcid":true,"given":"Jerry R.","family":"Meyer","sequence":"additional","affiliation":[{"name":"Naval Research Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,16]]},"reference":[{"key":"oe-34-13-23252-R1","doi-asserted-by":"publisher","first-page":"77","DOI":"10.1006\/spmi.1995.1017","type":"journal-article","volume":"17","author":"Yang","year":"1995","journal-title":"Superlattices Microstruct."},{"key":"oe-34-13-23252-R2","doi-asserted-by":"publisher","first-page":"45","DOI":"10.1049\/el:19960064","type":"journal-article","volume":"32","author":"Meyer","year":"1996","journal-title":"Electronics Lett."},{"key":"oe-34-13-23252-R3","doi-asserted-by":"publisher","first-page":"585","DOI":"10.1038\/ncomms1595","type":"journal-article","volume":"2","author":"Vurgaftman","year":"2011","journal-title":"Nat. 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