Polariton quantum dots comprising ultrashort carbon nanotubes

Patent metadata

Field	Value
Publication number	US-2023200098-A1
Application number	US-202117555488-A
Country	US
Kind code	A1
Filing date	Dec 19, 2021
Priority date	Dec 19, 2021
Publication date	Jun 22, 2023
Grant date	—

Abstract

A nanotube polariton quantum dot photon source device includes a substrate. A nanotube is arranged on the substrate, and an incident light source is configured to generate an exciton-plasmon polariton excitation in the nanotube. The nanotube emits a photon in response to the generated exciton plasmon polariton excitation. The nanotube has a length L < 50 nm to emit one or more photons at a desired frequency.

First claim

What is claimed is:

1 . A nanotube polariton quantum dot photon source device, comprising:
a substrate; a nanotube arranged on the substrate; and an incident light source configured to generate an exciton-plasmon polariton excitation in the nanotube and emit a photon, wherein the nanotube has a length L < 50 nm to emit one or more photons at a desired frequency.

2 . The device according to claim 1 , wherein the desired frequency comprises an infrared frequency.

3 . The device according to claim 2 , wherein the desired frequency comprises a near-infrared frequency.

4 . The device according to claim 1 , wherein a diameter of the nanotube is about 1.5 nm.

5 . The device according to claim 1 , wherein the incident light source comprises a laser arranged above a surface of the substrate on which the nanotube is arranged.

6 . The device according to claim 1 , wherein the incident light source comprises a light emitting diode (LED) fabricated on a surface of the substrate; and
a filter arranged above a surface of the substrate on which the nanotube is arranged, wherein the filter is configured to absorb incident light emitted from the LED and to pass a photon emission from the nanotube during an exciton-plasmon polariton excitation.

7 . The device according to claim 6 , wherein the LED is arranged below the nanotube.

8 . The device according to claim 1 , wherein the photon emission from the nanotube comprises a single-photon fluorescence.

9 . The device according to claim 7 , further comprising a dielectric layer arranged on the substrate and capacitively coupled to one end of the nanotube.

10 . A nanotube polariton quantum dot photon source device, comprising:
a substrate; a nanotube arranged on the substrate; and one or more electrodes connected to the nanotube, wherein the nanotube has a length L <50 nm.

11 . The device according to claim 10 , wherein the nanotube is configured to emit single photons by electroluminescence when a pulsed voltage or a pulsed current is applied to the one or more electrodes.

12 . The device according to claim 10 , wherein:
the one or more electrodes comprise a first electrode and a second electrode; a first substantially radial end of the nanotube is arranged on a surface of the substrate; the nanotube is connected to each of the first electrode and the second electrode; the first electrode and the second electrode are configured to receive a voltage or a current via an external circuit; and the nanotube is configured to emit a single-photon fluorescence in response to the electrodes receiving a pulsed voltage or current.

13 . The device according to claim 10 , wherein:
the one or more electrodes comprise a first electrode and a second electrode; the nanotube is connected to each of the first electrode and the second electrode; an electrical gate is arranged on the substrate and configured to receive an applied voltage, and a dielectric layer is arranged on the electrical gate; and the nanotube is capacitively coupled to the electrical gate via the dielectric.

14 . The device according to claim 13 , wherein an emission frequency of the nanotube is tuned based on an amount of voltage applied to the electrical gate.

15 . The device according to claim 13 , wherein a change in a degree of absorption of the nanotube is based on an amount of the voltage applied to the electrical gate.

16 . The device according to claim 13 , wherein a charge density in the nanotube is changed based on an amount of voltage applied to the electrical gate.

17 . The device according to claim 13 , wherein a degree to which the nanotube exhibits a plasmonic character or an excitonic character is based on an amount of voltage applied to the electrical gate.

18 . The device according to claim 10 , further comprising an array of nanotubes arranged on the substrate.

19 . A carbon nanotube dot quantum device, comprising:
a nanotube polariton optical resonator having two ends and a length less than 50 nm; a pair of tapered optical couplers, wherein each optical coupler is connected at a tapered end to a respective one of the two ends of the nanotube polariton optical resonator; and a pair of optical waveguides, wherein each waveguide is coupled to a non-tapered end of one tapered optical coupler, respectively.

20 . The carbon nanotube dot quantum device according to claim 19 , wherein:
an electrostatic gate voltage is coupled to the nanotube polariton optical resonator; and the tapered optical couplers are metallic.

Assignees

• IBM

Inventors

• Falk Abram L
• Farmer Damon Brooks
• Yuksel Anil

Classifications

• H01L51/56

  Electricity · mapped topic

• H01L51/502 Primary

  Electricity · mapped topic

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• H01L51/0048

  Electricity · mapped topic

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title