Decreasing the threshold current density in Si lasers fabricated by using dressed-photons

Tanaka, Hidekazu; Kawazoe, Tadashi; Ohtsu, Motoichi; Akahane, Kouichi

doi:10.1515/fma-2015-0001

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…of this paper 11 . The fabrication and operation principles of this device are based on the concept of the DP and are equivalent to those of highly efficient silicon light-emitting devices (i.e., LEDs and LDs) [12][13][14][15][16][17][18] ,specifically, these Si devices emit photons with high efficiency by exchanging the momenta of the electrons in the conduction band with those of phonons, which are the constituent elements of the DPs.…”

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confidence: 99%

SiC transmission-type polarization rotator using a large magneto-optical effect boosted and stabilized by dressed photons

Kadowaki

Kawazoe

Ohtsu³

2020

Sci Rep

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This paper reports the fabrication and operation of a transmission-type polarization rotator for visible light with a wavelength of 450 nm using indirect-transition-type semiconductor crystalline SiC in which Al atoms were implanted as a p-type dopant. A novel dressed-photon-phonon (DPP)-assisted annealing method was used for fabrication. The fabricated device exhibited a gigantic magnetooptical effect induced by interactions between photons, electrons, phonons, and magnetic fields in a nanometric space, mediated by dressed photons. The optical path length for polarization rotation was as short as the thickness of the p-n junction. It operated with a weak magnetic field on the order of mT, generated by injecting current to a ring-shaped electrode on the device surface. The Verdet constant was as large as 9.51 × 10 4 rad/T.m at a wavelength of 450 nm. SQUID measurements confirmed that the SiC crystal exhibited conspicuous ferromagnetic characteristics as a result of the DPP-assisted annealing. In this device, the dressed photons boosted the magnitude of the magnetooptical effect and stabilized the device operation of the polarization rotator.

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confidence: 99%

SiC transmission-type polarization rotator using a large magneto-optical effect boosted and stabilized by dressed photons

Kadowaki

Kawazoe

Ohtsu³

2020

Sci Rep

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“…At the end of this section, the fact that Si lasers have also been fabricated by DP-assisted annealing should be briefly reviewed. One example is a CW single-mode laser with a ridge waveguide structure of 500 µm length operated under room temperature (Figures 5(a) and 5(b)) [46]. Another example is a similarly operated quasi-CW multi-mode high-power laser (maximum output power = 100 W) with a long cavity (30 mm length) (Figure 5(c)) [7,47].…”

Section: Time Difference (Ns)mentioning

confidence: 99%

Perspective on an Emerging Frontier of Nanoscience Opened up by Dressed Photon Studies

Sakuma,

Ojima,

Ohtsu

2023

Nanoarchitectonics

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The core parts of developing dressed photon (DP) research that require advanced knowledge of highly mathematical quantum field theory and their potentially important impacts on the wide spectrum of long-term scientific activities in general, not necessarily restricted to those in the natural science sector, are succinctly explained in this article. Although a considerable number of remarkable technological achievements in the field of nanophotonics have been attained by utilizing DP phenomena, from the theoretical viewpoint, they remain enigmatic, as in the case of dark matter and energy in cosmology. Under such circumstances, an intriguing working hypothesis (WH) for DPs is proposed by the authors of this article through a combination of Ojima’s micro-macro duality theory and the Greenberg-Robinson theorem, claiming that the space-like momentum contribution is an inevitable element for quantum field interactions to occur. Note that, as the Schrödinger’s cat thought experiment clearly shows, the widespread common quantum mechanics knowledge is incapable of explaining how the invisible quantum world is connected to our familiar visible classical world. In the above-mentioned WH, the main reason why we cannot explain either DPs or dark entities in cosmology is shown to have roots in the fact that the prevailing theories have not revealed an important role of spacelike momentum in connecting the quantum and classical worlds. Our new WH further shows that the entire universe is connected by an instantaneous spacelike entropic spin network, as in the case of quantum spin entanglement explained in mainstream physics. Since such a network may have a close relation with the nonlocal consciousness field, which seems to be the final frontier of physics, our perspective on such a possibility is briefly given in the final section of this paper.

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“…Accordingly, with respect to Si, which is an indirect transition semiconductor, we have reported many high-efficiency light-emitting devices that utilize stimulated emission based on phonon-assisted processes. [19][20][21][22][23] The present photodetector is based on a mechanism utilizing carrier density changes due to this stimulated emission. Figure 1(a) shows a band diagram describing the mechanism of the present device.…”

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confidence: 99%

Uncooled Si infrared photodetector for 2 μm wavelength using stimulated emission by dressed photons

Kadowaki¹,

Kawazoe²,

Ohtsu³

et al. 2022

Appl. Phys. Express

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A Si infrared photodetector that operates without requiring to be cooled was fabricated, and its properties were evaluated. The function of this device is to detect, as an electrical signal, carrier density changes due to stimulated emission utilizing a phonon-assisted process via dressed photons. The photosensitivities of this device were 0.21 A/W, 0.03 A/W, and 0.01 A/W for wavelengths of 1.3 µm, 1.6 µm, and 2.0 µm, respectively, when the forward current density was 50 A/cm2, and the device exhibited a higher sensitivity for wavelengths greater than the cutoff wavelength.

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Decreasing the threshold current density in Si lasers fabricated by using dressed-photons

Cited by 4 publications

References 19 publications

SiC transmission-type polarization rotator using a large magneto-optical effect boosted and stabilized by dressed photons

SiC transmission-type polarization rotator using a large magneto-optical effect boosted and stabilized by dressed photons

Perspective on an Emerging Frontier of Nanoscience Opened up by Dressed Photon Studies

Uncooled Si infrared photodetector for 2 μm wavelength using stimulated emission by dressed photons

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