Lower bound of energy dissipation in optical excitation transfer via optical near-field interactions

• We theoretically analyzed the lower bound of energy dissipation required for optical excitation transfer from smaller quantum dots to larger ones via optical near-field interactions. The coherent interaction between two quantum dots via optical near-fields results in unidirectional excitation transfer by an energy dissipation process occurring in the larger dot. We investigated the lower bound of this energy dissipation, or the intersublevel energy difference at the larger dot, when the excitation appearing in the larger dot originated from the excitation transfer via optical near-field interactions. We demonstrate that the energy dissipation could be as low as 25 mu eV. Compared with the bit flip energy of an electrically wired device, this is about 10(4) times more energy efficient. The achievable integration density of nanophotonic devices is also analyzed based on the energy dissipation and the error ratio while assuming a Yukawa-type potential for the optical near-field interactions.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

Keyword

Bit-flips

Coherent interaction

Energy differences

Energy efficient

Error ratio

Excitation transfer

Integration density

Lower bounds

Nanophotonic devices

Optical excitations

Optical near field

Optical near-field interaction

Quantum Dot

Energy dissipation

Energy dissipators

Nanophotonics

Photoexcitation

Semiconductor quantum dots

Photonics

Fotonik

Publication and Content Type

ref (subject category)

art (subject category)